Drinking water quality · 2024
· Verified
· PWSID TX0430039
What's in Mckinney, TX tap water
Every one of the 11 core regulated contaminants reported for Mckinney, TX came in below its federal limit.
- !1 contaminant within 20% of a limit
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −4 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −13 core regulated contaminants never reported (11/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Bromate92% of the federal limit9.19 ug/L · limit 10 ug/L
Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
higher than 95% of U.S. systems
+22 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Cyanide | 128 ug/L | 200 ug/L |
| Copper | 0.741 mg/L | 1.3 mg/L |
| Chlorine Total | 2.24 mg/L | 4 mg/L |
| TTHM | 37 ug/L | 80 ug/L |
| HAA5 | 23 ug/L | 60 ug/L |
| Chlorite | 0.187 mg/L | 1 mg/L |
| Fluoride | 0.712 mg/L | 4 mg/L |
| Lead | 0.00108 mg/L | 0.015 mg/L |
| Atrazine | 0.2 ug/L | 3 ug/L |
| Nitrate | 0.399 mg/L | 10 mg/L |
| Barium | 0.06 mg/L | 2 mg/L |
| Simazine | 0.071 ug/L | 4 ug/L |
| Chromium | 1.3 ug/L | 100 ug/L |
| Chlorine | 0.027 mg/L | 4 mg/L |
| Bromodichloromethane | 15.2 ug/L | — |
| Bromoform | 4.71 ug/L | — |
| Chloroform | 2.23–17.6 ug/L | — |
| Dibromochloromethane | 14.7 ug/L | — |
| Escherichia coli (E. coli) | 0 | — |
| Total Coliform | 5 | — |
| Gross Beta Particle Activity | 5.3 pCi/L | 0 pCi/L |
| PFBA | 8.7 ng/L | — |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in Mckinney, TX's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
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.