Drinking water quality · 2024
· Verified
· PWSID TX0430005
What's in Frisco, TX tap water
14 contaminants in Frisco, TX's water sat at or above a federal limit, led by Lead at 1.9x the limit.
- !14 contaminants at or above a federal limit — worst is Lead at 1.9x
- !12 of 27 core regulated contaminants reported — 15 never appear in this report
- ✓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.
- −60 contaminants at or above a federal limit
- −0 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
- −11 core regulated contaminants never reported (12/27)
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
- Lead1.9× the federal limit28 ug/L · limit 15 ug/L
There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
Higher than 95% of TX systems that report it · higher than 95% of U.S. systems
- Chlorine1.0× the federal limit4 mg/L · limit 4 mg/L
Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
higher than 95% of U.S. systems
- Bromate1.0× the federal limit10 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
- Chlorite1.0× the federal limit1 mg/L · limit 1 mg/L
higher than 95% of U.S. systems
- HAA51.0× the federal limit60 ug/L · limit 60 ug/L
Long-term exposure above the federal limit is associated with an increased cancer risk.
higher than 95% of U.S. systems
- TTHM1.0× the federal limit80 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
higher than 95% of U.S. systems
- Cyanide1.0× the federal limit200 ug/L · limit 200 ug/L
- Fluoride1.0× the federal limit4 mg/L · limit 4 mg/L
Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
higher than 95% of U.S. systems
- Nitrate1.0× the federal limit10 mg/L · limit 10 mg/L
Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
higher than 95% of U.S. systems
- Barium1.0× the federal limit2 mg/L · limit 2 mg/L
Long-term exposure above the federal limit can raise blood pressure.
higher than 95% of U.S. systems
- Chromium1.0× the federal limit100 ug/L · limit 100 ug/L
higher than 95% of U.S. systems
- Turbidity1.0× the federal limit1 NTU · limit 1 NTU
High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
higher than 85% of U.S. systems
- Atrazine1.0× the federal limit3 ug/L · limit 3 ug/L
Long-term exposure above the federal limit can affect the cardiovascular and reproductive systems.
higher than 95% of U.S. systems
- Simazine1.0× the federal limit4 ug/L · limit 4 ug/L
+14 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Copper | 28 ug/L | 1300 ug/L |
| Bromodichloromethane | 14.9 ug/L | — |
| Bromoform | 2.4 ug/L | — |
| Chloroform | 16.1 ug/L | — |
| Dibromochloromethane | 10.4 ug/L | — |
| Cryptosporidium | Not detected | — |
| Escherichia coli (E. coli) | 0 | — |
| Giardia lamblia | Not detected | — |
| Total Coliform | 5 % | — |
| Gross Beta Particle Activity | 50 pCi/L | — |
| PFPeA | 7.6 ng/L | — |
| PFBS | 4.7 ng/L | — |
| PFHxA | 6.7 ng/L | — |
| PFBA | 13.799999999999999 ng/L | — |
What this report doesn't tell you
15 of the 27 contaminants a community water system normally reports do not appear anywhere in Frisco, 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)
4 PFAS compounds detected in Frisco, 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.
PFPeA
● Detected (no federal limit)PFBS
● Detected (no federal limit)PFHxA
● Detected (no federal limit)PFBA
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Frisco, TX buys its drinking water from NORTH TEXAS MWD WYLIE WTP.
Source
Treatment
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.