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Public Water Supply Notice – HAA and TTHM Violation


City of Osawatomie has Levels of Total Haloacetic Acids above Drinking Water Standards

Our water system recently incurred a protocol violation. Although this was not an emergency, as our customers we wanted to
share with you what happened and what we have done to correct the situation.

What happened?

We are required to monitor your drinking water on a regular basis for specific disinfectants and contaminants, including haloacetic acids. Results of regular monitoring are an indicator of whether or not our drinking water meets health standards.

When disinfection (such as the use of chlorine) is used in the treatment of drinking water, disinfectants combine with organic and inorganic matter present in water to form compounds called disinfection byproducts (DBP). EPA sets standards for controlling the levels of DBP in drinking water, including Haloacetic Acids (HAA) and Total Trihalomethanes (TTHM). Compliance is based on the four-quarter average of sample results for each location where HAA and TTHM samples are collected, called a locational running annual average (LRAA). The HAA standard for any one LRAA is 60 ug/L and the TTHM standard is 80 ug/L. Results for samples we collected on 6/15/2020 shows that our system exceeds the standard or maximum contaminant level (MCL) for HAA and for TTHM. For 2nd Quarter of 2020, one of the LRAA where HAA samples are collected was 61 ug/L, and two of the LRAA where TTHM samples are collected was 85 and 84 ug/L.

What does this mean?

This does not represent an immediate risk to the health or safety of your water. If it had been, you would have been notified within 24 hours. However, due to our customer service requirements and an abundance of transparency we are obligated to make you aware.

What should you do?

You do not need to use an alternative water supply, e.g., bottled water. However, if you have specific health concerns, consult your doctor. Please share this information with all other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

What is being done?

Disinfection is an important and necessary treatment process, to destroy all disease-causing organisms in your drinking water. Staff has begun feeding activated carbon to the receiving water, trapping the organic matter and settling it out before it is allowed to proceed through the treatment and into the disinfection process.

For more information, please contact:

Michael Scanlon
City Manager
City of Osawatomie
P.O. Box 37
Osawatomie, KS 66064

This notice has been sent to you by the City of Osawatomie, Kansas.
State Water System ID#: KS2012105
Date Distributed: November 30, 2020