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Source Water Assessment and Protection Program

Happy Source Water Protection Week (September 28-October 4)! The best way to assure we have high quality drinking water at the tap is to protect our beautiful water sources. If we keep our rivers, lakes and underground wells free from pollution, it’s easier and less expensive to keep water safe and healthy. Check out Ohio EPA's Instagram and LinkedIn for tips throughout the week, and visit AWWA's page to learn more about Source Water Protection Week: Source Water Protection Week - American Water Works Association.


Ohio's Source Water AsClose up of the emblem used on public water drains that says, “Don’t Pollute: Flows to Waterways”. Indicates the water that flows in the drain empties into a waterway.sessment and Protection (SWAP) program assists communities with protecting their sources of drinking water (streams, lakes and aquifers) from contamination. Also known as "Drinking Water Source Protection" and "Wellhead Protection," the SWAP program addresses over 4,800 public water systems in Ohio and does not address private residential water systems.

Although Ohio's public water systems treat their drinking water to meet health-based standards, treatment is expensive and may not address every kind of contaminant. By taking steps to avoid chemical spills in the areas surrounding a well field or upstream from a surface water intake, a community can help reduce the costs of their water and better ensure a safe and high-quality supply of drinking water. 

For any question or concerns regarding source water assessment and protection, contact our SWAP team at internet.whp@epa.ohio.gov.

Endorsed Drinking Water Source Protection Plans

Municipal public water systems develop a written plan that addresses sources of contamination that have a potential to impact their source water. Non-municipal public water systems complete a checklist that is tailored to the types of potential contaminant sources identified in their protection area. Protection plans and checklists are submitted to Ohio EPA for review and endorsement.

Overview and Frequently Asked Questions

What is Drinking Water Source Protection?

For each public water system, Drinking Water Source Protection involves two phases: assessment and protection.

An overview map of an example source water protection area with PWSID#:1234567, showing both the inner and outer management zone. Has a legend indicating what wells and potential contamination sources are represented by on the map. Also, indicates that this example aquifer’s susceptibility is moderate.Assessment is determining the area around the public water system's well(s) or intake(s) that will be the focus of protection (delineation), and then listing all of the facilities or activities within that area that could potentially release chemicals that would contaminate the source water (inventory). Based on the delineation, inventory and the local geology, the likelihood of the source water becoming contaminated is determined (susceptibility analysis). Since 2001, Ohio EPA staff have provided public water systems with assessments; however, some public water systems prefer to hire a hydrogeologic consulting firm to complete their assessment.

A sign that says, “Drinking Water Protection Area Report Spills: 1-800-282-9378”. The sign is located by a road and appears to be surrounded by grassy lands with trees in the background.

Protection refers to the activities undertaken by the public water supplier and other interested parties to protect the SWAP area. For this purpose, Ohio EPA strongly encourages municipal public water suppliers to form a local planning team and develop a Drinking Water Source Protection Plan.

See "Developing a Drinking Water Source Protection Plan" in the next tab for detailed information on writing a protection plan.

Where did the SWAP program come from?

The federal Safe Drinking Water Act amendments of 1986 established the Wellhead Protection Program, which required states to administer a source water protection program for their systems using ground water. In 1992, Ohio's Wellhead Protection Program was approved by the U.S. Environmental Protection Agency (U.S. EPA). Administered by Ohio EPA, the program provided guidance and technical assistance to public water systems, who were encouraged to complete assessments and protection plans using their own resources. Ohio EPA staff reviewed the assessments and formally endorsed them, when complete.

In 1996, the Safe Drinking Water Act was amended again. Section 1453 was added, providing states with federal funding to complete source water assessments for their public water systems. At that time, the program was extended to include surface water systems and was renamed "Source Water Protection." Also, an additional piece of information was required in an assessment, a Susceptibility Analysis. Susceptibility is defined as the likelihood that contaminants will impact a public water system's source water(s) at concentrations that would pose a concern.

It is the intent of Congress that a public water system use the information in their source water assessment to develop a drinking water source protection plan. Ohio EPA convened a Source Water Advisory Group to develop Ohio's Source Water Assessment Program, which was approved by U.S. EPA in 1999. In Ohio, Ohio EPA's Division of Drinking and Ground Waters administers the program.

What's the difference between the Source Water Protection (SWAP) program and the Wellhead Protection (WHP) program?

Source Water Protection ("SWAP") and Wellhead Protection ("WHP") are both national programs designed to help protect our nation’s drinking water. They have the same goal and the same methods, but originated at different times historically, with different scopes. The Wellhead Protection program was created by the 1986 amendments to the Safe Drinking Water Act and focused exclusively on ground water systems. Ten years later, Congress recognized that the program was faltering due to lack of funding. They passed the 1996 amendments to the Safe Drinking Water Act, which extended source water protection to surface water systems and provided funding.

In Ohio, the WHP program is merged into the Ohio SWAP program, which is administered by Ohio EPA. The terms WHP and SWAP are used interchangeably. (In some states, the two programs are kept separate due to state-specific administrative or legal issues.) In Ohio, the differences between the two programs are mostly of historical interest and are summarized below.

Scope: WHP focused exclusively on ground water systems and prioritized large community systems. SWAP extended the program to all public water systems, including surface water systems and non-community systems.

Work focus: The national WHP program provided standards for public water systems to conduct assessments (delineation and inventory of a protection area) and develop a local protection plan. The national SWAP program exclusively addressed assessments.

Funding: National funding was not provided for WHP. For SWAP, a one-time federal grant was awarded for conducting assessments to each state with a U.S. EPA-approved SWAP program. Ohio’s SWAP program was approved in November 1999.

Susceptibility Analysis: The national WHP program did not require susceptibility analyses as part of assessment activities. This requirement was added to the SWAP program. In 2001-2003, Ohio EPA completed susceptibility analyses for all public water systems that had already completed their own assessments under WHP. Public water systems with an endorsed "Wellhead Protection Plan" are considered to meet all the guidelines for a "Protection Plan" under SWAP.

What is a public water system?

Public water systems (PWS) are regulated by the Ohio EPA, Division of Drinking and Ground Waters (Ohio EPA, DDAGW). A public water system is defined as a system that provides water for human consumption to at least 15 service connections or serves an average of at least 25 people for at least 60 days each year. This includes water used for drinking, food preparation, bathing, showering, tooth brushing and dish-washing. Public water systems range in size from large municipalities to small churches and restaurants that rely on a single well. There are three types of public water systems:

An aerial view of the city of Lima’s wastewater treatment plant. There is a tree line around the plant and a nearby road. An example of a non-transient non-community public water system. The photo is of a walkway up to a school building. An example of a transient non-community public water system. The photo is of a shell gas station, with lots of cars pulled up to the pumps.


Community water systems serve at least 15 service connections used by year-round residents or regularly serve at least 25 year-round residents. Examples include cities, mobile home parks and nursing homes.

Non-transient, non-community systems serve at least 25 of the same persons over six months per year. Examples include schools, hospitals and factories.

Transient, non-community systems serve at least 25 different persons over 60 days per year. Examples include campgrounds, restaurants and gas stations. In addition, drinking water systems associated with agricultural migrant labor camps, as defined by the Ohio Department of Agriculture, are regulated even though they may not meet the minimum number of people or service connections.

Public water systems use either a ground water source or a surface water source, including ground water under the direct influence of surface water. In Ohio, more than 4,800 public water systems serve approximately 11.1 million people daily.

Private water systems are regulated by the Ohio Department of Health. Private water systems are households and small businesses that serve fewer than 25 people per day 60 days out of the year, and are thus not public water systems. Examples include small bed and breakfasts, small day-cares and small churches.

Are there any regulations that apply to SWAP areas?

Yes, there are regulations. Click on the link below for a list of the activities that are prohibited or restricted in drinking water source protection areas:

Are reports written for systems that purchase their water?

Ohio EPA completes assessment reports only for those systems that actually pump water from an aquifer or a surface water body. Any public water system that pumps its own water and then sells it to other public water systems should make copies of the Assessment Report available to the purchasing systems.

What is a Drinking Water Source Protection Plan?

A Drinking Water Source Protection Plan is a locally designed and implemented plan to protect the source of drinking water from contamination at the source. The focus and scope of a protection plan is dependent on the size and type of water system, as discussed below:

Municipal public water systems (serving a political jurisdiction) and investor-owned water companies using ground water: A typical plan addresses (1) educating residents and decision-makers about protecting the source water; (2) including source water concerns in the system's contingency plan; and (3) strategies to reduce the risk posed by specific potential contaminant sources. Monitoring of the raw water may be an additional element. The protection plan may be implemented as a completely voluntary effort or through a local ordinance that would give the jurisdiction the ability to enforce certain measures.

Available Protection Planning Guides for Municipal Ground Water Systems

Non-municipal public water systems (serving mobile home parks, nursing homes, schools, factories, and small businesses) using ground water: When Ohio EPA staff complete a system's assessment report, they attach a checklist that is tailored to the types of potential contaminant sources identified in the system's protection area. The owner/operator is asked to check off strategies that they intend to implement or are already implementing and return the checklist to Ohio EPA. This checklist then becomes the system's protection plan. Some non-municipal systems may want to develop a more comprehensive protection plan. If so, the system may also use the materials developed for municipal systems.

Public water systems using surface water: Most surface water systems serve a large population, and the protection areas are typically many square miles in extent. Ohio EPA currently is developing guidance for these systems on how to develop a drinking water source protection plan. Public water system operators are encouraged to strongly support any watershed planning organizations that are active in the watershed upstream from the water plant's intake.

Available Protection Planning Guide for Surface Water Systems

Which public water systems in Ohio already have an endorsed plan?

Click here for a list of Municipal Systems with Endorsed Protection Plans.

Click here for a list of Non-Municipal Systems with Endorsed Protection Plans.

How can I get involved in Drinking Water Protection Planning for my community?

Shows a city worker setting up a paint template by a drain on the street. The template he is using says “Dump No Waste – Drains to Stream” and has a fish on it.Contact the public water system superintendent and ask if a Drinking Water Source Protection Plan is in place or being developed. If not, you may want to offer your assistance in organizing a protection team in your community. Much of the effort involved is organizational, and anyone with energy and organizational skills can be a valuable resource. A good protection plan will make full use of existing agencies, regulations and volunteer groups to carry out the protective strategies that are chosen. Drinking water sources are vulnerable to contamination that can cause a community significant expense and threaten public health. Water is a shared resource, and individuals, citizen groups and local communities can participate in many activities to help protect their drinking water sources. U.S. EPA provides information on how to learn about source water protection in your area, things you can do to protect your drinking water and steps you can take in source water planning at the community level. See Citizen Involvement in Source Water Protection.

Developing a Drinking Water Source Protection Plan

When developing a Drinking Water Source Protection Plan, Ohio EPA recommends municipal public water systems utilize Ohio EPA's Drinking Water Source Protection Plan Template. The Protection Planning Quick Start Guide explains protection plan components in more detail and provides examples that public water systems can utilize in their own protection plan.

Additionally, the following Ohio EPA guidance documents are currently in the review process; however, they are available here for additional details for anyone interested in developing a local drinking water source protection plan: 

For additional resources that can be used in source water protection planning, drop-down the "Publications and Resources" tab below.

Sole Source Aquifers in Ohio

A map of Ohio showing sole source aquifers in Ohio, which appear to mainly be in western Ohio.

U.S. EPA defines a Sole Source Aquifer (SSA) as an aquifer that supplies at least 50 percent of the drinking water consumed in the area overlying the aquifer. These areas may have no alternative drinking water source(s) that could physically, legally and economically supply all those who depend on the aquifer for drinking water.

The SSA designation protects an area's ground water resource by requiring U.S. EPA to review certain proposed projects within the designated area. All proposed projects receiving federal funds are subject to review to ensure that they do not endanger the water source.

For more information on SSAs, including GIS data, visit http://water.epa.gov/infrastructure/drinkingwater/sourcewater/protection/solesourceaquifer.cfm.

Greater Miami SSA

Allen County SSA

Catawba Island SSA

Pleasant City SSA

Public Drinking Water Supply Beneficial Use

A woman in a yellow coat wading through a body of water, waist deep. They have gloves on collecting water samples.In general, the Division of Drinking and Ground Waters administers Safe Drinking Water Act (SDWA) programs and the Division of Surface Water administers the Clean Water Act (CWA) programs. However, the two divisions share common goals with regard to assessing and protecting sources of drinking water. They have been collaborating since 2002 to strengthen the connection between the CWA and SDWA with more robust assessments of Ohio source waters.

The Integrated Water Quality Monitoring and Assessment Report indicates the general conditions of Ohio's waters and identifies waters that are not meeting water quality goals. To view the entire report, click here.

Publications and Resources

Guidance Documents, Fact Sheets, Educational Materials and Publications

(If you can't find what you are looking for here, search our Online Publications Catalog.)

Source Water Protection Implementation by Public Water Systems

In mid-January 2015, Ohio’s Source Water Protection (SWAP) program sent letters to 736 public water systems, requesting they fill out an online report identifying the source water protection strategies being implemented in their communities (for municipal systems) or on their properties (for non-municipal systems). Only community public water systems with high or moderately susceptible source waters were targeted. The results are summarized in the following fact sheet.

Guidance Documents - Source Water Protection Program

  • Ohio's Source Water Assessment and Protection Program This original 1999 report outlines the purpose and creation of the Source Water Assessment and Protection Program (SWAP), as well as methods of evaluating the program’s success. It highlights what defines a public water system, how Source Water Assessment Reports are created -- whether it be for Groundwater or Surface Water Systems – and what pieces of information are contained in each report. It also indicates potential contaminants of concern, contaminant sources, and potential significant contaminant source inventory checklists. Lastly, it emphasizes the importance of community engagement for the success of the SWAP program.
  • Delineation Process Manual Provides an in-depth explanation of the delineation process, including methods and method selection for each public water system, special situations taken into consideration, and data procurement for modeling. It also contains brief guides on WhAEM and GFLOW (modeling programs), which are used to create some delineations.
  • Potential Contaminant Source Inventory Process Manual Provides an explanation as to what a potential contaminant source inventory (PCSI) is, as well as how to conduct a PCIS for the SWAP program. This includes potential pre-site visit preparation, information to identify on the site visit as well as potential contaminants, communication with the public water system owner, and post-visit activities. The document includes a list of potential contaminants that could be identified in the inventory report.
  • Susceptibility Analysis Process Manual Defines what a susceptibility analysis is and explains how it is used by a public water system, as well as how to conduct a susceptibility analysis for the SWAP Program. A checklist is included that identifies the following: determining the hydrogeological setting and DRASTIC index, ground water quality evaluation (including a list of potential contaminants), potential contaminant source evaluation, and determining aquifer susceptibility. Lastly, a list containing water quality standards, disinfectant requirements, turbidity requirements, and organic compound groupings is included.
  • Drinking Water Source Assessment and Protection Plan Review Criteria Summarizes the criteria used to create delineations, inventory, and Protection Plan reports. Highlights how the SWAP assessments and development of Protection Plans result in a protected drinking water source. Provides additional resources at the end of the document.

Guidance Documents - Protection Planning

  • Developing Source Water Protection Plans for Public Drinking Water Systems Using Inland Surface Waters Explains how to form and operate a Source Water Protection committee and the role that the committee plays in protecting a public water system, which includes the following: using water quality data to identify the greatest threats, writing the plan, obtaining endorsement, education and outreach, creating contingency plans, monitoring, and implementation. It also contains a list of potential funding sources and benefits of participating in Source Water Protection. Identifies the difference between a Watershed Action Plan and a Source Water Protection Plan to emphasize the importance of having a committee that focuses on drinking water needs.
  • Developing Local Drinking Water Source Protection Plans in Ohio Summarizes the process of forming and operating a Source Water Protection committee and what to include in the written protection plan. Emphasizes how plans are implemented through voluntary action, incentives, ordinances, and regional protection plans, with containing a case study example demonstrating why implementation is essential. Appendices containing educational brochure examples, Ohio Administrative Code 3745-85-01 regarding contingency plans, drinking water source are protection plan checklist, a summary of wellhead protection tools, and additional sources.
  • Guidance for Ground Water Monitoring in Wellhead Protection/Source Water Protection Areas Assists in determining how valuable Groundwater monitoring is to a source water protection area by providing early warning signs, and outlines when it is appropriate to use ground water monitoring to prevent potential contamination. Explains the designing and installation process of a monitoring well network, including developing the sampling and analysis plan and developing procedures for data management and analysis, as well as types of sampling equipment. Includes case studies.
  • Volunteer Stream Monitoring: A Methods Manual Visit this US EPA site to access a volunteer stream monitoring methods manual.

Technical Reports

  • Gibsonburg Karst Investigation (2010) A report on the investigation of the Silurian dolomite (karst) aquifer in Gibsonburg, Ohio. Analyzes the results of dye trace tests and the impact these results have on the delineation of this aquifer source.
  • Clark County Karst Investigation (2007) A report on the investigation of the Dissected Niagara Escarpment in Mad River Township, Clark County, Ohio. Analyzes the results of dye trace tests regarding ground water flow rates, the interaction between surface and ground water, karst development, and the impact these results have on the delineation of this aquifer.

Grant Opportunities and Other Funding Sources

Source Water Roadsign Templates

The templates below have both been approved by ODOT and can be used to create source water protection roadsigns. These templates must be utilized if you are applying for the protective strategies grant. 

Source Water Protection Ordinances and Examples

Some communities choose to enforce their plan through adoption of a source water protection ordinance that places some restrictions on activities that may occur within the source water protection area. Ohio EPA recommends that, at a minimum, responsibility for periodic updates of the plan be incorporated into the job description or one or more municipal employees.

Chagrin River Watershed PartnersChagrin River Watershed Partners Model OrdinancesOrdinances can be a powerful option for addressing a large number of contaminant sources, and can provide the authority for ongoing enforcement at the local level. Zoning channels future development away from the well field or watershed to a less sensitive area. If the protection area is undeveloped and not zoned, the community can zone it a "natural resource protection area." If the protection area is developed and not zoned, the community may introduce zoning, with recognition that existing development needs to be grandfathered. If the protection area is already zoned, "overlay zoning" may be introduced.

The Chagrin River Watershed Partners in conjunction with local and state agencies has developed a number of model ordinances and reslolutions relate to riparian setbacks, wetland setbacks, storm water management, and erosion and sediment control. Examples of these can be found on the CRWP website:
crwp.org/model-regulations-for-watershed-protection.

Examples of model ordinances for Source Water Protection can be found on U.S. EPA's website:
epa.gov/nps/urban-runoff-model-ordinances-prevent-and-control-nonpoint-source-pollution.

Example Ordinances

The following is a list of ordinances that have been enacted by municipalities. For more information, please contact the public water system.

Fact Sheets - General

  • Source Water Protection in Ohio A brief overview that distinguishes the difference between a Source Water Protection Assessments and Source Water Protection Plans. Explains different levels of susceptibility a system might have. Provides where one can view drinking water source protection areas as well as additional resources.
  • Ground Water in Ohio A brief overview of what groundwater is, where it comes from and how it is stored. Explains why contamination of groundwater is a concern, as well as how land use impacts water supplies. Contains additional resources.

Fact Sheets - Technical

  • Drinking Water Source Protection and Biosolids Reuse A brief overview of what biosolids are and how they are classified. Explains the restrictions in place to protect public water systems. Provides where one can view drinking water source protection areas as well as additional resources.
  • Drinking Water Source Protection and Leaking Underground Storage Tanks A brief overview of who the Bureau of Underground Storage Tank Regulation (BUSTR) and why underground storage tanks (UST) must be regulated to prevent drinking water contamination. Provides where one can view drinking water source protection areas as well as additional resources.
  • Drinking Water Source Protection and Manure Storage at Concentrated Animal Feeding Facilities A brief overview of how the Ohio Department of Agriculture’s Livestock Environmental Permitting program enforces construction standards for manure storage or treatment facilities and how this protects drinking water sources. Provides where one can view drinking water source protection areas as well as additional resources.
  • Drinking Water Source Protection and Solid Waste Landfills A brief overview of the Ohio EPA’s Division of Materials and Waste Management (DMWM) regulates solid waste disposal facilities and how this protects drinking water sources. Provides where one can view drinking water source protection areas as well as additional resources.
  • Drinking Water Source Protection and the Voluntary Action Program A brief overview of the Ohio EPA’s Division of Environmental Response and Revitalization (DERR) regulates the voluntary cleanup of contaminated properties. Provides where one can view drinking water source protection areas as well as additional resources.
  • Drinking Water Source Protection and Land Application of Treated Wastewater A brief overview of treated wastewater being used for Land application and how Ohio EPA’s Division of Surface Water (DSW) regulates the way wastewater is applied and stored to reduce drinking water contamination. Provides where one can view drinking water source protection areas as well as additional resources.

Educational Materials

Ohio EPA Education Materials

Agricultural Education and Best Management Practices

Septic System Education

Stormwater Best Management Practices

Source Water Protection - American Water Works Association  The American Water Works Association provides a number of resources related to Source Water Protection. They also host an "Exemplary Source Water Protection Award" to recognize water systems that have developed and are implementing source water protection programs.