Water Purification / Distribution

                                                Attention Clover Hill III Residents

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Haloacetic Acids (HAA5) MCL Violation at Clover Hill III Water System

Our water system recently violated a drinking water standard. Although this incident was not an emergency, as our customers, you have a right to know what happened and what we are doing to correct this situation.

We routinely monitor for the presence of drinking water contaminants.  Quarterly test results from August 2017 through March 2018 show that our system has exceeded the standard or maximum contaminant level (MCL), for HAA5.  The standard for HAA5 is 60 parts per billion.  It is determined by averaging the results of samples collected at each individual sampling location for the past 12 months.  The level(s) of HAA5 averaged at one of our sampling locations ranged from 62.1 to 62.9 parts per billion for the last three quarterly monitoring periods.

Monitoring Period

Haloacetic Acids (ppb)


July – September 2017



October – December 2017



January – March 2018



1-     Compliance is based upon the Locational Running Annual Average for each sample site and is calculated quarterly.

What should I do?

  • There is nothing you need to do.  You do not need to boil your water or take other corrective actions.  Should a situation ever arise where the water is not safe to drink, you will be notified immediately.
  • Certain people may be at an increased risk.  Customers with severely compromised immune systems; infants; pregnant women; and the elderly are at an increased risk, and should receive advice from their health care providers about drinking this water.

What does this mean?

This is not an emergency.  If it had been an emergency, you would have been notified immediately.  HAA5 are five haloacetic acid compounds which form when disinfectants react with natural organic matter in the water.  People who drink water containing haloacetic acids in excess of the MCL over many years may have an increased risk of getting cancer.

What is being done?

Because the water the County provides to our customers in Clover Hill III is produced by the City of Frederick, we are working closely with their staff to find a resolution. We have taken immediate steps to increase water quality monitoring and have increased the frequency of routine flushing of the water system.  At the same time, City of Frederick staff are looking at methods to improve treatment at their Fishing Creek source, which provides the majority of your drinking water.  We anticipate these efforts will result in immediate improvements to water quality, however because compliance is based on an annual average, it may take several months for this average to drop below the MCL.

For more information, please contact the Frederick County Division of Utilities and Solid Waste Management at 301-600-1825.

Please share this information with all the 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.

This notice is being sent to you by the Frederick County Division of Utilities and Solid Waste Management.  Clover Hill III Water System - State Water System ID# 010-0037.


Date distributed: April 3, 2018

Department Responsibilities

The Water Purification/Distribution Department is responsible for the operation of the County's water treatment plants and distribution systems.  The County's primary water treatment facilities are staffed 24 hours per day, 7 day per week.  Smaller satellite facilities are staffed to provide operator attention several hours per day, 7 days per week.  This Department's certified operators provide routine daily operation of the County's water supply infrastructure to ensure that customers of the County's Public water systems receive water that continually complies with Federal Safe Drinking Water Act (SDWA) requirements.


For water and/or wastewater emergencies occurring on weekends, holidays, and after hours please call 301-600-2194.

Frozen Pipes

Frozen pipes can result in one of the more expensive repairs a homeowner may face. 

The Metropolitan Washington Council of Government has information on preventing this from happening in your home on their Protect Your Pipes web page.