Private Well Testing

Iowa's Private Well Grants Program (PWG) provides free water testing to all private well owners and users for the analytes listed below. The Iowa DNR recommends that all private well owners have their water tested at least annually. To get your private well tested, please contact your local county health department. 

County Health Department - contact list (click here)

Private Well Services - Grant money available

In addition to private well testing, the PWG program offers funding for the private well related services listed below.

Please follow these steps:

  1. Contact your county health department (click here) and notify them that you are wanting one of the above services.
  2. Contact a DNR certified well contractor to perform the work. The bullets below tell what type of work each type of contractor can perform, and links to a list of those contractors sorted by their city of residence. 
    1. Well Drillers (click here) - (Shock chlorination, well assessments, reconstruction, well plugging (except pump and plumbing work))
    2. Pump Installers (click here) - (shock chlorination, well assessments, reconstruction (upper 10 feet only), well plugging)
    3. Well Pluggers (click here) - (can only plug Class 1 and Class 3 wells - all other well plugging must be performed by a well driller or pump installer)
  3. Non-certified contractors or non-certified people are not legally allowed to perform well services in Iowa, so always double check with the person you hire to ensure they are certified by and on the lists linked above. 
  4. Tell the contractor you are seeking Private Well Grants funds and will require the following documents following completion of work:
    1. Fully completed DNR form based on the type of work
    2. Itemized "paid" invoice
  5. Submit these items to the county health department (click here)
  6. The county will reimburse you directly once your required forms and invoice have been reviewed and approved.

More Information

If you are seeking testing for analytes that are not listed above, please contact your county health department to discuss your situation. If the county thinks additional testing is needed, the county may be able to contact the State Hygienic Laboratory to seek approval for further testing of more complex contaminants, or provide additional guidance to improve your water quality. Please see the State Hygienic Laboratory GTC website to learn more.

Private Well Grants - Guidance Document for Qualifying Services - this document provides detailed information regarding what types of wells and specific services qualify for PWG funding.

The PWG program is a collaborative program with administration through the Iowa Department of Health and Human Services (HHS), and technical assistance  provided by the Iowa DNR's Private Well Program. To learn more about the PWG Program, please visit this HHS web page: Private Well Grants (PWG).

2 Why should I test my water supply?

The groundwater that supplies your water well can become contaminated through natural processes and human related activities. In addition, Iowa is made up of unique geological settings that can create special construction, maintenance, treatment, and water testing needs.

Even if you believe that your well water is safe to drink, it's important to periodically sample and test your water to assess any health related concerns the water may create. The information you receive from the test will help you make informed decisions on well maintenance and water treatment. It will also help you determine if you need to call a certified well contractor or seek an alternative source of drinking water.

Groundwater can have unsafe levels of natural pollutants such as, such as arsenic, lead and radon, and modern lifestyle related contaminants like motor fuels, the solvents and cleaners used to help clean clothing, homes and businesses, and chemicals that are beneficial for industrial and agricultural use. The degree to which a potential health threat may exist will depend on the amount and type of the contamination, the depth and protections incorporated in the well's construction, and how you use the water. In some cases, contamination of the water can be detected by sight, taste or smell; however, in most instances the contamination can only be detected through laboratory analysis of an untreated sample of the well water.

3 How often should I test my water supply?

  • Bacteria and nitrate - at least once per year.
  • Nitrite - at least once per year if you have high nitrates.
  • Arsenic and Manganese - at least once, or more often if you are in an area where other wells exhibit a change in arsenic levels. .
  • Depending on the local geology and land use nearby your well, you may want to test for additional contaminants or test more frequently to look for high seasonal or an increase in overall contaminant levels.

Other reasons to schedule a well water test include:

  • Neighboring well owners are having problems with their water quality.
  • A change in color, taste, odor, hardness, corrosion, sediment, and anything else unusual with the well water.
  • When you find that any of the contaminants you test for are close to the Maximum Contaminant Level (MCL) recommended by the Environmental Protection Agency (EPA) and you want to continue to consume the water,
  • After any well service
  • Flooding near your well site.
  • When the well has sat idle for a long period of time without being used - like when you go south for the winter, or the home sits empty for more than a few weeks.

Coliform bacteria and nitrate are most likely to be found during wet weather, when runoff and excess soil moisture carry contaminants into shallow groundwater sources or through defects that may exist in your well's design, borehole or casing. In general, these are the wet periods of late spring and early summer as well as the wet periods of the fall.

Pesticides used on lawns, gardens, or farm fields are most likely to be present in greatest concentrations soon after they are applied. With the exception of large chemical spills, it takes excess soil moisture to carry pesticides into the ground which makes late spring and early summer good times to test for pesticides if they are one of your concerns.

For naturally occurring contaminants like arsenic, fluoride, and radium, testing can be done at anytime because these contaminants are relatively stable in the groundwater.

5 What should I test for?

At a minimum, you should test your private drinking water supply for coliform bacterianitrate and nitrite, and manganese. These contaminants are the common indicators used to provide basic information on drinking water safety. It's easy and inexpensive to test for these contaminants. When any of them are present above the Environmental Protection Agency's maximum contaminant levels (MCL) or health advisory level, you should not drink or consume the water without proper treatment.

We also recommend that every private well have at least one arsenic test performed so that the well user understands if arsenic is an issue with the water supply. More information on arsenic can be found on the State Hygienic Laboratory Arsenic Fact Sheet.

You may want to test for pesticides and other farm related chemicals if you obtain your water from a shallow well or your well is old, or if you obtain your water from a well finished in the shallower Karst bedrock regions of the state.

Pesticides are mostly modern chemicals that are used to control weeds and insects, and improve crop and turf production. They are applied on farms and in communities. You likely have a number of pesticides that you use routinely in and around your home. Atrazine is one of the most commonly found pesticides discovered during well water analysis. You can learn more about Atrazine in drinking water and health concerns that may be attributed to this chemical by visiting the CDC Atrazine Information web page. For more information on specific pesticide well water testing you may want to consider, please contact the State Hygienic Laboratory at the University of Iowa, 800-421-4692.

There are a number of other contaminants that you may want to test for based on your location in the state, the location of the well, the aquifer supplying your water, the age of the well (based on construction standards), and the land use or land history nearby your well. Contaminants like nitrate, arsenic, fluoride, radium, and lead are naturally occurring in some aquifers and may require specialized water treatment to reduce or eliminate the exposure risk. Certain locations may be susceptible to contamination from things like Volatile Organic Compounds (VOCs) such as gasoline, plastics, adhesives, dry-cleaning fluids, refrigerants, paints and solvents; animal waste like manure, carcasses and compost, or a number of emerging contaminants that may be linked to our modern lifestyle and activities.

These contaminants can end up in the groundwater due to local use and application, improper mixing, handling and storage, improper disposal, accidental spills, poor well construction, improperly abandoned wells, or the lack of natural protections in the local geology that normally provide protection to the local aquifers. If the natural protective features and barriers are not present in your region, the aquifers are more susceptible to contamination and you should test your water more often.

In the northeast region of Iowa, Karst bedrock features can allow surface water immediate access to the shallow groundwater. This makes the shallow groundwater more susceptible to surface contaminants. Wells in this part of the state require more stringent standards for well construction, increased water quality monitoring and increased maintenance of any drinking water treatment devices needed. For additional information on Karst terrain and water wells, please view our water wells in Karst areas web page.

If your water supply lacks adequate protections, is in poor repair, or utilizes an aquifer that interacts with surface water or very shallow groundwater, you should be especially aware of water borne diseases. Bacteria, viruses and protozoa are microorganism groups that contain pathogens that can cause waterborne diseases. For additional information on water borne diseases please see the Centers for Disease Control, Iowa Department of Public Health or your local county environmental health office.

Some private water systems may have corrosion issues that create the potential to release lead from the home's plumbing into the water in the pipes. Corrosion in house plumbing can be described as a dissolving or wearing away of metal caused by a chemical reaction between water and your plumbing. There are a number of factors involved in the extent to which lead enters the water, these include:

  • the chemistry of the water (acidity and alkalinity) and the types and amounts of minerals in the water,
  • the amount of lead it comes into contact with,
  • the temperature of the water,
  • the amount of wear in the pipes,
  • how long the water stays in pipes, and
  • the presence of protective scales or coatings inside the plumbing materials.

We recommend that private water systems have at least one lead test performed to help determine if corrosion may be an issue with the plumbing. Additional testing may be required if you change your water source or your method of water treatment.

For advice on what your well should be tested for based on your well location and aquifer please contact your local county environmental health office, the State Hygienic Laboratory, the Iowa Department of Public Health or the Iowa DNR.

6 Who can perform the water sampling?

Nearly everyone who can follow instructions can draw a water sample and submit it for analysis. Since the water analysis normally looks for health indicator bacteria, it's important that the water sampling be performed with great care. Samples can be easily contaminated by the sample collector which will lead to a false indication that the water system is contaminated. If you are unsure about sampling procedures, call your local county environmental health office or your local Iowa Certified Well Contractor to obtain information on how you can have a water sample taken by experienced staff.

For additional information on how to correctly obtain a sample of your well water and submit it for testing, please refer to the State Hygienic Laboratory frequently asked questions web page.

nearly all of iowa's counties participate in the grants-to-counties well program. the grants-to-counties program can provide free water sampling and analysis to qualifying private drinking water systems. to find out if your county participates in the grants-to-county well program or to arrange sampling of your water system, please refer to the list of County Environmental Health Sanitarians and contact the Sanitarian's office in the county where the well is located.

7 Can any lab perform the water analysis?

All water testing should be performed by Iowa DNR Certified Drinking Water Laboratories. These laboratories use accepted drinking water lab methods, employ highly trained staff to perform the water analysis, and use DNR accepted standard operating procedures to help ensure your results are accurate.

To obtain additional information on well water testing or to order a water sample test kit, you can contact the State Hygienic Laboratory at the University of Iowa or any of the other Iowa DNR certified drinking water laboratory.

8 How do I interpret the laboratory report?

When you have your water tested for other types of contaminants, the Environmental Protection Agency (EPA) maximum contaminant levels and guidelines should be used to determine if your water is safe to drink. The Water Systems Council wellcare® water testing information page offers additional guidance on well water testing and understanding your water analysis report.

The State Hygienic Laboratory at the University of Iowa is also a great resource and offers a number of documents for private wells. "Reading your water analysis report" is a document that can help you understand how to interpret private drinking water analysis reports based on their testing services.

9 What if my water supply is not safe to drink?

First and most important - stop consuming the water and find an alternative source for all of your consumable water needs. This can be bottled water, a neighboring water supply that is known safe, water from a public water supply like a neighboring town or city, or water that has been properly treated for the contaminants present in the water.

Then you should determine what the best short term and long term solutions are for your safe drinking water needs. Your options are to use bottled water for all consumable water needs, providing adequate water treatment at one or more drinking water taps, rehabilitation or renovation of the well or water system so that it provides safe water, connection to a known safe water supply, or replacement of your existing water supply.

In some cases, the issues that can cause drinking water contamination are simple and can be remedied by adding protections to the existing well, or a simple point of use water treatment system. Other times, the only effective solution will be an alternative source of water. 

You should discuss the water quality issues with a Iowa DNR Certified Well Contractor. They can help diagnose your water issues and provide guidance on repairs or well replacement. Anytime you hire a contractor to work on your well or water system, the contractor must be certified by the Iowa DNR in the proper categories of well services.

Certification ensures that the individual you hire meets a minimum level of knowledge and skill in the areas needed for your job. It's important to note that you should select your contractor carefully because even though a contractor may be certified by the state, they may not have the equipment or the experience to perform all well services.

To obtain additional information on water system rehabilitation, renovation, repair or replacement, please contact your local Iowa DNR Certified Well Driller or Certified Pump Installer.

To learn more about ownership of a private water supply, please look at our private well consumer information booklet.

10 Can I use a water treatment device?

Water treatment devices are commonly used to produce safe drinking water. The type of device you need and the installation, maintenance, and monitoring of your treatment device will depend on the type of contamination that you have and the type of device you choose for treatment. Some contaminants require very specialized water treatment. Even if you already have some form of water treatment, you may not be reducing or removing all contaminants that can cause short or long term health issues.

One last important point to consider is that all water treatment devices require ongoing maintenance, monitoring, and testing to ensure that they are properly treating the water. The maintenance intervals and cost of maintenance vary with each specific treatment device. Make sure to inquire about ongoing maintenance schedules and the true cost of ownership when you discuss your water treatment options.

All drinking water treatment devices that are sold in Iowa must undergo third-party testing and be registered under a program administered by the Iowa Department of Public Health (IDPH). For additional information on water treatment system registration, please contact the IDPH at their home drinking water treatment system registration web page.

To learn more about water treatment device options, please look at the information on the following links:

For more information:

Please contact:

Erik Day
Water Supply Engineering Section
6200 Park Ave. Suite 200
Des Moines, IA 50321
515-402-7981