We read 16 results from City of Denton’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 150,037 people · Water system ID TX0610002 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
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 |
|---|---|---|---|---|
| Bromateaverage · range ND to 7.3 · listed as a violation in the report · Treatment plants · 2025 report, page 3 | 1.5 ppb | 0.1 ppb | 10 ppb | Above the health goal15x the health goal |
| Copper90th percentile of homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 3 | 0.63 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.1x the health goal |
| Gross beta (radioactivity)average · range 6.5 to 6.8 · listed as a violation in the report · sampled 2023 · Entry points · 2025 report, page 3 | 6.65 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 3 | 1.5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal7.5x the health goal |
| Total coliform bacteriahighest month · listed as a violation in the report · Distribution system · 2025 report, page 4 | 0.83 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Atrazineaverage · range 0.1 to 0.1 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.1 ppb | 0.15 ppb | 3 ppb | Below the health goal |
| Bariumaverage · range 0.04 to 0.05 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.08 to 4.5 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 3.21 ppm | None set | 4 ppm | Below the legal limit |
| DEHP (a phthalate)average · range ND to 0.6 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.3 ppb | 12 ppb | 6 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 3.8 to 11 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 11 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 9.69 to 13 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 13 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.3 to 0.72 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.51 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)average · range 0.31 to 0.36 · listed as a violation in the report · Entry points · 2025 report, page 3 | 0.34 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidsaverage · range 190 to 249 · Entry points · 2025 report, page 4 | 220 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Lake Ray Roberts plant, highest of 2 sources · 2025 report, page 4 | 0.19 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumaverage · range 24.1 to 37.2 · Entry points · 2025 report, page 4 | 30.7 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 Denton’s water between Jan 2023 and Oct 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFBS4.7 pptFound in 3 of 8 samples · highest resultNo federal limit in force for this one
- Lithium10.1 ppbFound in 1 of 8 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
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.
Bacteria and viruses
Found: Total coliform bacteria
What removes it: UV purification (and tell your utility).
More districts: Texas water quality · All states · Something look wrong? Tell us