We read 26 results from Clear Lake City Water Authority’s 2025 water quality report. No results over a legal limit; 7 above a health goal or guideline.
Serves about 89,702 people · Water system ID TX1010056 · 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 |
|---|---|---|---|---|
| Atrazinehighest measured · range 0.11 to 0.16 · listed as a violation in the report · Entry points · 2025 report, page 2 | 0.16 ppb | 0.15 ppb | 3 ppb | Above the health goal1.1x the health goal |
| Copper90th percentile of homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 3 | 0.41 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.4x the health goal |
| Gross beta (radioactivity)highest measured · range ND to 7.2 · listed as a violation in the report · sampled 2023 · Entry points · 2025 report, page 2 | 7.2 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 2023 · Customer taps · 2025 report, page 3 | 1.2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal6x the health goal |
| PFOS (a PFAS)highest measured · range ND to 5.8 · sampled 2024 · Entry points · 2025 report, page 3 | 5.8 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.5x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Radium (combined 226 + 228)highest measured · range 1.5 to 1.5 · listed as a violation in the report · sampled 2023 · Entry points · 2025 report, page 2 | 1.5 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Total coliform bacteriahighest month · listed as a violation in the report · Distribution system · 2025 report, page 2 | 1.11 % positive | 0 % positive | 5 % positive | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.04 to 0.12 · listed as a violation in the report · Entry points · 2025 report, page 2 | 0.12 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.5 to 4.4 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 2.84 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · Timber Cove Dr sample point · 2025 report, page 3 | 35 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · Timber Cove Dr sample point · 2025 report, page 3 | 38 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.53 to 0.53 · listed as a violation in the report · sampled 2024 · Entry points · 2025 report, page 2 | 0.53 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · listed as a violation in the report · Entry points · 2025 report, page 2 | 0.89 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)highest measured · range ND to 4 · sampled 2024 · Entry points · 2025 report, page 3 | 4 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Simazinehighest measured · range ND to 0.08 · listed as a violation in the report · Entry points · 2025 report, page 2 | 0.08 ppb | 4 ppb | 4 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · Treatment · 2025 report, page 3 | 0.14 NTU | None set | 1 NTU | Below the legal limit |
| Bromodichloromethanehighest measured · range ND to 12.8 · Distribution system · 2025 report, page 3 | 12.8 ppb | None set | None | No health limit |
| Bromoformhighest measured · range ND to 1.2 · Distribution system · 2025 report, page 3 | 1.2 ppb | None set | None | No health limit |
| Chloroformhighest measured · range ND to 32.9 · Distribution system · 2025 report, page 3 | 32.9 ppb | None set | None | No health limit |
| Dibromochloromethanehighest measured · range ND to 3.4 · Distribution system · 2025 report, page 3 | 3.4 ppb | None set | None | No health limit |
| Lithiumhighest measured · range ND to 11 · sampled 2024 · Entry points · 2025 report, page 3 | 11 ppb | None set | None | No health limit |
| Nickelhighest measured · range ND to 3.1 · printed as 0.0031 ppm · Entry points · 2025 report, page 2 | 3.1 ppb | None set | None | No health limit |
| PFBA (a PFAS)highest measured · range ND to 10 · printed as 0.01 ppb · sampled 2024 · Entry points · 2025 report, page 3 | 10 ppt | None set | None | No health limit |
| PFBS (a PFAS)highest measured · range ND to 3.9 · printed as 0.0039 ppb · sampled 2024 · Entry points · 2025 report, page 3 | 3.9 ppt | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range ND to 7.8 · printed as 0.0078 ppb · sampled 2024 · Entry points · 2025 report, page 3 | 7.8 ppt | None set | None | No health limit |
| PFPeA (a PFAS)highest measured · range ND to 8.8 · printed as 0.0088 ppb · sampled 2024 · Entry points · 2025 report, page 3 | 8.8 ppt | 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 Clear Lake City Water Authority’s water between Apr 2023 and Mar 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA4 pptFound in 1 of 18 samples · highest resultBelow the federal limit that takes effect in 2029 (4 ppt)
- PFOS6.7 pptFound in 12 of 18 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS6 pptFound in 12 of 18 samples · highest resultNo federal limit in force for this one
- PFBS5.7 pptFound in 12 of 18 samples · highest resultNo federal limit in force for this one
- Lithium12.9 ppbFound in 6 of 18 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.
Industrial chemicals and pesticides
Found: Atrazine
What removes it: Carbon block or RO.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross beta (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOS (a PFAS), PFOS (EPA testing)
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