Dallas County, Texas: drinking water report. Dallas County's 2.6 million residents get their water primarily from surface reservoirs managed by the City of…
Dallas County's 2.6 million residents get their water primarily from surface reservoirs managed by the City of Dallas and the North Texas Municipal Water District. The main sources include Lake Ray Hubbard, Lake Lewisville, Lake Grapevine, and the East Fork of the Trinity River. Unlike cities dependent on aquifers, Dallas County's surface water supply is renewable but exposed to agricultural runoff, urban stormwater, and upstream wastewater discharges that can shift water quality seasonally.
The EPA's UCMR5 monitoring has detected PFAS at multiple sampling points within Dallas County water systems. Surface water sources here are exposed to diffuse contamination rather than the point-source military contamination seen in cities like San Antonio. The Trinity River watershed receives treated wastewater effluent from upstream communities, and PFAS compounds in consumer products enter the water cycle through these discharges.
Dallas Water Utilities has historically maintained good compliance records, but disinfection byproducts – trihalomethanes and haloacetic acids formed when chlorine reacts with organic matter – remain a recurring concern in warm months. According to the 2024 Consumer Confidence Report, several monitoring locations recorded DBP levels within 80% of the EPA's maximum contaminant levels during summer sampling.
Surface water quality in Dallas County fluctuates with seasons and rainfall. Summer heat and algae blooms increase treatment chemical demand, while heavy rains wash contaminants from urban surfaces into reservoirs.
Check your water to see current data for your ZIP code. An activated carbon filter handles disinfection byproducts effectively, while reverse osmosis addresses PFAS. Our water filter guide helps you match the right filter type to your specific concerns. For historical readings and trend analysis, grab your detailed report. See our Texas page for statewide data.