Water Quality

When it comes to quality control, tap water beats out its bottled counterpart in just about every way possible. That's because your tap water undergoes more frequent health and quality testing than bottled water. Your Dayton water sources are tested every day.

In fact, we conduct analysis on more than 200 samples daily to check for bacteria and other potential contaminants. Bottled water plants only require tests once a week.

Your tap water is also a part of the Dayton Well Field Protection Program, internationally-recognized and the first program approved by the Ohio Environmental Protection Agency. It consistently meets or exceeds all state and federal drinking water standards.

Remember These Facts

  • Tap water is safer than bottled water.
  • Tap water is thousands of times less expensive than bottled water.
  • Unlike tap water, bottled water creates mountains of waste and contributes to an array of other environmental problems.

Still Not Convinced?

If all this doesn't convince you of the benefits of turning on your faucet - remember this fact: Nearly 40% of all bottled water itself comes right from the tap.

What About...?

  • "Hard Water" - Dayton softens extremely hard well water so that water heaters, detergent, and soap can function efficiently. Hardness is caused by natural minerals in the well water. The average hardness for Dayton water in 2010 was 155 milligrams per liter (or 9 grains per gallon).
  • "Rusty Water" - Residents from throughout the distribution system occasionally experience reddish or brownish discolored water. This is usually caused by increased flow through water mains, which dislodges iron deposits. This is usually not a health threat, but consumers should refrain from using the water until the disturbance is over. After that, the water should be allowed to run until it clears before using.
  • Chlorine is added to drinking water as a disinfectant. Treatment plants add chlorine at a constant dosage to maintain an adequate concentration throughout the distribution system, as required by the Environmental Protection Agency.
  • "Cloudy Water" is usually caused by the release of dissolved air from water. This is quite common and harmless. When watched closely, the dissolved air (cloudiness) slowly travels upward, out of solution. Cloudiness can also be caused when natural minerals in water come out of solution.
  • "White Spots in Coffeepots" - Minerals dissolved in water settle out when water is heated. The minerals will accumulate as "white spots in coffeepots." To remove these spots, fill the coffeepot with vinegar and let it sit overnight. In the morning, rinse out the coffeepot several times with water.
  • Fluoride occurs naturally in City of Dayton well water and in groundwater throughout the United States. Our water treatment plants supplement the natural fluoride to protect teeth from dental caries (cavities). The natural fluoride is increased from approximately 0.3 milligrams per liter (mg/L) to 0.9 mg/L. The U.S. Department of Health and Human Services is proposing a change to the recommendation for the optimal fluoride level in drinking water to prevent tooth decay. The new recommendation, 0.7 mg/L of fluoride, replaces the previous recommended range of 0.7 to 1.2 mg/L. There are several reasons for this change, including that Americans have access to more sources of fluoride than they did when water fluoridation was first introduced in the United States." Ohio law requires water systems serving a population > 5,000 (unless exempted from the law) with natural fluoride less than 0.8 mg/L to add fluoride to maintain concentrations in the range of 0.8 mg/L to 1.3 mg/L. Systems that add fluoride are required to monitor fluoride concentrations.
  • Lead - The most common cause of lead in drinking water is the corrosion of plumbing fixtures and solders containing lead. The drinking water supplied to the distribution system of the City of Dayton does not contain lead at a detectable level. As a precaution, before using the water for drinking or cooking, lead can be reduced or eliminated from drinking water by allowing water to run until it's gets colder. The City of Dayton Water Quality Laboratory extensively samples and tests drinking water from homes and other sites. Lead is not detected in most of the samples.
  • Bacteria - The City of Dayton samples and tests untreated and treated water for coliform bacteria on a routine basis. Coliform bacteria are a group of bacteria that can indicate contamination. The lime softening process, filtration, and disinfection at Dayton's water plants helps to protect water from microbial contamination, including bacteria.


Instruments continuously monitor water at the water plants and Dayton's water distribution system. In addition, samples from wells, both water plants, and the distribution system are collected and tested by water plant operators and employees at Dayton's Central Water Quality Laboratory.

For more information, please call the City of Dayton Water Supply and Treatment Division at 937-333-6093.