Water Quality Reports
The City of McKinney receives its water from the North Texas Municipal Water District (NTMWD), which is responsible for the operation of water treatment facilities and distribution to its member cities. The city operates a water distribution system that provides the water received to its residents and businesses. The City of McKinney has received and maintains a “Superior” rating from the Texas Commission on Environmental Quality (TCEQ).
The City of McKinney performs regular sampling and testing of its water distribution system throughout the year to comply with TCEQ and Environmental Protection Agency (EPA) requirements. Each year, the city produces a Water Quality Report for its residents and businesses that contains information about the McKinney water system including source water, the levels of detected contaminants and compliance with drinking water rules. The report includes data collected in the calendar year and the most recent required compliance test results, which is summarized and reported per TCEQ and EPA requirements. The report also includes data from sampling and testing performed by TCEQ on the McKinney water system.
NTMWD Annual System Maintenance: March 2 - 30, 2020
For over ten years, NTMWD conducted an Annual System Maintenance of its water delivery system in February or March of each year. During this temporary period, the NTMWD adjusts its treatment process from using chloramines (free chlorine and ammonia) to free-chlorine, by removing ammonia from the treatment process disinfecting the water only with chlorine. This common practice is used as preventive maintenance to kill bacteria that, though harmless when consumed by humans, can introduce unwanted taste and odor, and create issues with maintaining a disinfectant residual, and is done so in accordance with TCEQ requirements.
During the NTMWD’s March 2019 Annual System Maintenance, the city collected additional samples during the second and fourth week to analyze disinfection byproducts during this time period, which were separate from the normal quarterly sampling required by TCEQ. The samples were collected from four sites sampled each quarter by TCEQ during NTMWD’s normal operations and at McKinney’s three pump stations, which are the locations where water is received from NTMWD but are not included as part of TCEQ’s normal quarterly sampling.
Disinfection byproducts (DBPs) are chemicals that form, during drinking water treatment and distribution, when naturally occurring organic matter reacts with chlorine or other disinfectants used to kill pathogenic organisms. All commonly used disinfectants form DBPs. The EPA regulates DBPs (Total Trihalomethanes (TTHM) and Total Haloacetic Acids (HAA5)) at levels that current research considers safe. The Stage 2 DBP Rule establishes the compliance calculation for the Locational Running Annual Average (LRAA). The LRAA is calculated for each site by adding the four most recent quarters of data and dividing by four.
The table below presents the test results for TTHM and HAA5 from 2019.
|TTHM||Jan||Mar 15***||Mar 26***||June||Aug||Oct||Avg.***||MCL|
|Aspen Dr.*||27.8||77.7||94.0||28.7||44.5||42.0||45.4||80 ppb LRAA|
|Eisenhower Dr. *||27.9||80.6||93.8||27.3||40.9||42.2||44.5||80 ppb LRAA|
|Hills Creek Dr.*||27.4||79.9||92.1||28.4||40.6||41.6||44.3||80 ppb LRAA|
|Community Blvd.*||28.3||89.6||107||**||38.9||40.3||68.6||80 ppb LRAA|
|Gerrish Pump Station||76.5||85.9||81.2||80 ppb LRAA|
|McKinney Ranch Pump Station||76.6||88.3||82.5||80 ppb LRAA|
|University Dr. Pump Station||76.0||85.9||81.0||80 ppb LRAA|
|HAA5||Jan||Mar 15***||Mar 26***||June||Aug||Oct||Avg.***||MCL|
|Aspen Dr.*||17.1||29.9||25.8||14.0||26.2||22.0||21.6||60 ppb LRAA|
|Eisenhower Dr.*||15.2||32.3||31.5||14.6||23.0||24.0||22||60 ppb LRAA|
|Hills Creek Dr.*||15.2||24.3||24.9||15.7||23.8||22.0||20.7||60 ppb LRAA|
|Community Blvd.*||15.5||30||33.3||**||21.1||21.0||22.8||60 ppb LRAA|
|Gerrish Pump Station||30||23.3||26.7||60 ppb LRAA|
|McKinney Ranch Pump Station||29.8||31.1||30.5||60 ppb LRAA|
|University Dr. Pump Station||33.6||26.8||30.2||60 ppb LRAA|
MCL = Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water.
ppb = parts per billion or micrograms per liter or one ounce in 7,350,000 gallons of water
|*||Data results from sample testing performed by TCEQ.|
|**||Data results from sample testing performed by TCEQ not presented on TCEQ’s Drinking Water Watch website.|
|***||In March 2019, samples were taken during the second and fourth week to provide data during the annual maintenance period. The first quarter average is calculated by adding the January sample result plus the two March results and dividing by three. This method was used to calculate the annual average for each identified sampling location. The average for TTHM and HAA5 is calculated as a rolling average over the last four 4-quarters’ samples.|
The City of McKinney will perform the same sampling and testing as described above for the pending NTMWD Annual System Maintenance scheduled for March 2 - 30, 2020. Results will be reported following receipt of the results.