EPA SDWIS Compliance Records
Drinking Water Compliance Report for Houston, TX
5 public water systems serve Houston — real federal compliance history, not a marketing claim.
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Water systems serving this city
12
Total compliance records on file
1
Health-based violations
What this means for your tap water: a "health-based" violation means a system exceeded an actual contaminant safety threshold at some point — different from a paperwork or reporting violation, which is far more common and far less concerning. Houston's systems average 0.6 health-based violations each, ranking about middle-of-the-pack (#12 of 20 we track). Which specific system serves your address determines whether that history applies to you — check the list below rather than assuming.
Systems Serving Houston
CITY OF HOUSTON
2,970,543 people served3 violations on record, including health-based violations.
- October 2015 — MR— resolved
- December 2019 — MON— resolved
- May 2025 — TT(health-based)— resolved
CLEAR LAKE CITY WATER AUTHORITY
89,702 people served3 violations on record, none health-based.
- October 2015 — MR— resolved
- October 2016 — MR— resolved
- November 2016 — MON— resolved
CITY OF HOUSTON UD 5 - KINGWOOD
80,073 people served4 violations on record, none health-based.
- October 2012 — MR— resolved
- April 2019 — MR— resolved
- November 2010 — MR— resolved
- October 2013 — MR— resolved
HOUSTON-GREENSPOINT
76,323 people servedNo violations on record.
HARRIS COUNTY MUD 165
40,503 people served2 violations on record, none health-based.
- April 2019 — MR— resolved
- December 2014 — MR— resolved
Source: EPA Safe Drinking Water Information System (SDWIS), via Envirofacts. Water-system-level records, not address-specific — homes on private wells or served by a different system than listed here aren't reflected. A resolved violation means the system returned to compliance; it doesn't mean water quality is currently at risk.
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