What EPA records show for Clear Lake City Water Authority
EPA system ID TX1010056 · serves Harris County, TX · about 89,702 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Clear Lake City Water Authority (EPA TX1010056)
What EPA records show for Clear Lake City Water Authority, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (TX1010056) since July 1, 2021, as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 0.88 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2024–Dec 31, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 9.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Clear Lake City Water Authority use chloramine?
EPA treatment records (state-reported) list chloramines for Clear Lake City Water Authority. EPA record
Reported results in EPA records (data as of Oct 14–15, 2026)
EPA's UCMR 5 testing looked for 30 contaminants here and found 9.
Lithium: found in 6 of 18 samples, average 3.77 µg/L, highest 12.9 µg/L (EPA UCMR 5 testing, Apr 2023–Jan 2024)
PFBA (a PFAS): found in 14 of 18 samples, average 7.2 ppt, highest 14.5 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFHxA (a PFAS): found in 15 of 18 samples, average 5.8 ppt, highest 9.5 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFPeA (a PFAS): found in 15 of 18 samples, average 5.7 ppt, highest 8.8 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFOS (a PFAS): found in 12 of 18 samples, average 3.8 ppt, highest 6.7 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFHxS (a PFAS): found in 12 of 18 samples, average 3 ppt, highest 6 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFBS (a PFAS): found in 12 of 18 samples, average 2.7 ppt, highest 5.7 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFHpA (a PFAS): found in 7 of 18 samples, average 1.3 ppt, highest 3.7 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
PFOA (a PFAS): found in 1 of 18 samples, average 0.20 ppt, highest 4 ppt (EPA UCMR 5 testing, Apr 2023–Mar 2024)
Lead: 9 in 10 homes tested came in at or below 0.88 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2024–Dec 31, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
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