We read 30 results from City of Frisco’s 2025 water quality report. No results over a legal limit; 7 above a health goal or guideline.
Serves about 231,910 people · Water system ID TX0430005 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenichighest measured · range 1 to 1 · NTMWD Wylie plant · 2025 report, page 13 | 1 ppb | 0.004 ppb | 10 ppb | Above the health goal250x the health goal |
| Bromatehighest measured · range 2.5 to 2.5 · NTMWD Leonard plant · 2025 report, page 16 | 2.5 ppb | 0.1 ppb | 10 ppb | Above the health goal25x the health goal |
| Copper90th percentile of homes tested · sampled 2023 · Customer taps · 2025 report, page 18 | 0.46 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.5x the health goal |
| Gross beta (radioactivity)highest measured · range 5.3 to 5.3 · sampled 2024 · NTMWD Wylie plant, highest of 2 sources · 2025 report, page 14 | 5.3 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested · sampled 2023 · Customer taps · 2025 report, page 18 | 2.31 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal12x the health goal |
| Manganesehighest measured · range 0.03 to 0.09 · NTMWD Leonard plant · 2025 report, page 20 | 0.09 ppm | — | 0.05 ppm guideline | Above the guideline1.8x the guideline (taste, odor or stains; not a health limit) |
| pHhighest measured · range 7.3 to 8.8 · NTMWD Wylie plant · 2025 report, page 20 | 8.8 | — | — | Outside the normal rangeAlkaline water can leave scale |
| Atrazinehighest measured · range 0.1 to 0.1 · NTMWD Wylie plant · 2025 report, page 14 | 0.1 ppb | 0.15 ppb | 3 ppb | Below the health goal |
| Bariumhighest measured · range 0.04 to 0.06 · NTMWD Wylie plant · 2025 report, page 13 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.3 to 3.86 · Frisco distribution system · 2025 report, page 15 | 2.16 ppm | None set | 4 ppm | Below the legal limit |
| Chloridehighest measured · range 29 to 92.5 · NTMWD Wylie plant · 2025 report, page 20 | 92.5 ppm | — | 250 ppm guideline | Within the guideline |
| Cyanidehighest measured · range 47 to 56 · NTMWD Wylie plant · 2025 report, page 13 | 56 ppb | 150 ppb | 200 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 11.1 to 35.6 · Frisco distribution system · 2025 report, page 16 | 22 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 21.9 to 42.9 · Frisco distribution system · 2025 report, page 16 | 36 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.35 to 0.49 · NTMWD Wylie plant, highest of 2 sources · 2025 report, page 13 | 0.49 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.08 to 0.87 · NTMWD Wylie plant · 2025 report, page 13 | 0.87 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfatehighest measured · range 84.7 to 147 · NTMWD Wylie plant · 2025 report, page 20 | 147 ppm | — | 250 ppm guideline | Within the guideline |
| Total coliform bacteriahighest month · Frisco distribution system · 2025 report, page 12 | Not detected | 0 % positive | 5 % positive | Not detected |
| Total dissolved solidshighest measured · range 182 to 455 · NTMWD Wylie plant · 2025 report, page 20 | 455 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · NTMWD Wylie plant, highest of 2 sources · 2025 report, page 17 | 0.29 NTU | None set | 1 NTU | Below the legal limit |
| Bromodichloromethanehighest measured · range 7.7 to 14.9 · Frisco distribution system · 2025 report, page 19 | 14.9 ppb | None set | None | No health limit |
| Bromoformhighest measured · range 1.18 to 2.4 · Frisco distribution system · 2025 report, page 19 | 2.4 ppb | None set | None | No health limit |
| Calciumhighest measured · range 31.2 to 61.3 · NTMWD Wylie plant · 2025 report, page 20 | 61.3 ppm | None set | None | No health limit |
| Chloroformhighest measured · range 4.48 to 16.1 · Frisco distribution system · 2025 report, page 19 | 16.1 ppb | None set | None | No health limit |
| Dibromochloromethanehighest measured · range 7.53 to 10.4 · Frisco distribution system · 2025 report, page 19 | 10.4 ppb | None set | None | No health limit |
| Hardnesshighest measured · range 5.61 to 11.7 · NTMWD Wylie plant, highest of 2 sources · 2025 report, page 20 | 11.7 gpg (200 ppm) | — | — | Very hard |
| PFBA (a PFAS)average · range 5.34 to 9.13 · printed as 0.00686 ppb · sampled 2024 · Frisco system (UCMR 5) · 2025 report, page 19 | 6.86 ppt | None set | None | No health limit |
| PFBS (a PFAS)average · range 2.74 to 3.81 · printed as 0.00311 ppb · sampled 2024 · Frisco system (UCMR 5) · 2025 report, page 19 | 3.11 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range 2.8 to 4.87 · printed as 0.00373 ppb · sampled 2024 · Frisco system (UCMR 5) · 2025 report, page 19 | 3.73 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 41.9 to 88 · NTMWD Wylie plant · 2025 report, page 20 | 88 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Frisco’s water between Dec 2023 and Sep 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS4.7 pptFound in 2 of 4 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross beta (radioactivity)
What removes it: Reverse osmosis.
Sediment or cloudy water
Found: Manganese
What removes it: Oxidation filter.
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