Clear Lake City Water Authority
EPA ID: TX1010056 · 89,702 people served · 193 ZIP codes
Five years of EPA monitoring have produced no violations for Clear Lake City Water Authority — the supplier serving 89,702 residents has kept every contaminant level within federal limits, a result that places it among the top-performing utilities for systems with a service population of comparable size.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 5 (2024) to 192 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Clear Lake City Water Authority Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Clear Lake City Water Authority serves a community with a median household income of $63,056 and an estimated 3,257,472 residents across its service area. Approximately 55% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 51% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
Clear Lake City Water Authority's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Harris County, Texas rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points. Surface water sources near wastewater outfalls may face additional treatment challenges.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 444 detections recorded. 15 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in Texas
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Clear Lake City Water Authority (EPA ID: TX1010056) is a community water system in Texas that serves approximately 89,702 people from surface water sources.
This system provides water to 193 ZIP codes across 3 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 7 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 186 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 193 ZIP codes:
77001 · 77002 · 77003 · 77004 · 77005 77006 · 77007 · 77008 · 77009 · 77010 77011 · 77012 · 77013 · 77014 · 77015 77016 · 77017 · 77018 · 77019 · 77020 77021 · 77022 · 77023 · 77024 · 77025 77026 · 77027 · 77028 · 77029 · 77030 77031 · 77032 · 77033 · 77034 · 77035 77036 · 77037 · 77038 · 77039 · 77040 77041 · 77042 · 77043 · 77044 · 77045 77046 · 77047 · 77048 · 77049 · 77050 77051 · 77052 · 77053 · 77054 · 77055 77056 · 77057 · 77058 · 77059 · 77060 77061 · 77062 · 77063 · 77064 · 77065 77066 · 77067 · 77068 · 77069 · 77070 77071 · 77072 · 77073 · 77074 · 77075 77076 · 77077 · 77078 · 77079 · 77080 77081 · 77082 · 77083 · 77084 · 77085 77086 · 77087 · 77088 · 77089 · 77090 77091 · 77092 · 77093 · 77094 · 77095 77096 · 77097 · 77098 · 77099 · 77201 77202 · 77203 · 77204 · 77205 · 77206 77207 · 77208 · 77209 · 77210 · 77212 77213 · 77215 · 77216 · 77217 · 77218 77219 · 77220 · 77221 · 77222 · 77223 77224 · 77225 · 77226 · 77227 · 77228 77229 · 77230 · 77231 · 77233 · 77234 77235 · 77236 · 77237 · 77238 · 77240 77241 · 77242 · 77243 · 77244 · 77245 77246 · 77247 · 77248 · 77249 · 77250 77251 · 77252 · 77253 · 77254 · 77255 77256 · 77257 · 77258 · 77259 · 77260 77261 · 77262 · 77263 · 77265 · 77266 77267 · 77268 · 77269 · 77270 · 77271 77272 · 77273 · 77274 · 77275 · 77276 77277 · 77278 · 77279 · 77280 · 77282 77284 · 77285 · 77286 · 77287 · 77288 77289 · 77290 · 77291 · 77292 · 77293 77294 · 77296 · 77297 · 77298 · 77299 77505 · 77507 · 77598
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Clear Lake City Water Authority (TX1010056) on EPA.gov.
Frequently Asked Questions
Is Clear Lake City Water Authority water safe to drink?
Based on EPA records, Clear Lake City Water Authority has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Clear Lake City Water Authority serve?
Clear Lake City Water Authority serves approximately 89,702 people across 193 ZIP codes in Texas.
Where does Clear Lake City Water Authority get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.