Drinking water quality · 2024
· Verified
What's in Mckinney, TX tap water
23 contaminants were measured in the Mckinney, TX water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 23
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- TX
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Mckinney, TX
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFBA
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Mckinney, TX buys its drinking water from NORTH TEXAS MWD WYLIE WTP.
Source
Treatment
- PLANT - 3601 REDBUD BLVD
Distribution
Also buys water from NORTH TEXAS MWD WYLIE WTP.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 9.19 ug/LHighest single sampleTreatment plant | 0 ug/LMCLG | Approaching the limit |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 37 ug/LRunning annual avgLocational Running Annual Average | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 23 ug/LRunning annual avgLocational Running Annual Average | None set | Within the limit |
| Chlorite | 0.187 mg/LAverageLevel Of Quarterly Data | 1 mg/LMCL | Within the limit |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 15.2 ug/LMaximumSystem-wide | None set | Detected — no federal limit |
| BromoformA trihalomethane disinfection byproduct. | 4.71 ug/LMaximumSystem-wide | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 2.23–17.6 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| DibromochloromethaneA trihalomethane disinfection byproduct. | 14.7 ug/LMaximumSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Cyanide | 128 ug/LHighest single sampleSystem-wide | None set | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.712 mg/LHighest single sampleSystem-wide | 4 mg/LMCLG | Within the limit |
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0.399 mg/LHighest single sampleSystem-wide | 10 mg/LMCLG | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.741 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.00108 mg/L90th percentileAt the tap | 0.015 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.06 mg/LHighest single sampleSystem-wide | 2 mg/LMCLG | Within the limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 2.24 mg/LAverageLevel Of Quarterly Data | 4 mg/LMCL | Within the limit |
| Chromium | 1.3 ug/LHighest single sampleSystem-wide | None set | Within the limit |
VOCs & pesticides
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.027 mg/LAverageLevel Of Quarterly Data | 4 mg/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Reported level2024 | None set | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 5Reported level2024 | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 5.3 pCi/LMaximumTreatment plant | 0 pCi/LMCLG | Detected — no federal limit |
People also ask about Mckinney, TX's water
+Is Mckinney, TX tap water safe to drink in 2024?
Every one of the 23 contaminants measured in Mckinney, TX's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Mckinney, TX tap water?
23 contaminants were measured in Mckinney, TX's 2024 Consumer Confidence Report, spanning disinfection byproducts, inorganic chemicals, and metals. 10 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in Mckinney, TX tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Bromate. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Mckinney, TX's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Mckinney, TX's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.