Katy, TX: 6 Violations — 83/100 (2026)
6 ZIP codes · 8 water systems · Updated 2026-06-03
Public water monitoring in Katy shows a safety record well above the TX median — health-based violations are isolated exceptions rather than recurring patterns, the city's systems have stayed compliant across recent reporting cycles, and no cluster of recurring exceedances appears in any single service area.
How Katy Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Katy, TX
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Katy score across all safety grades.
What You Should Know About Katy Water
- Your city's water systems recorded 6 violations in the past 5 years.
- Average lead level: 0.0018 mg/L.
- Homes built before 1986: 16% — older plumbing may contain lead solder.
- Estimated remediation: $2,440 per household.
- CDC health risk index: 11.19.
Who Supplies Your Water in Katy
Katy, TX is covered by 3 major water utilities out of 8 federally tracked systems, each managing its own pipes, treatment processes, and EPA filings. What a household gets from the tap depends on which provider's system serves that address.
Overview
We track water quality and home safety data for 6 ZIP codes in Katy, Texas, covering 8 community water systems serving approximately 395,745 people.
6 of 6 ZIP codes (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Katy: B (83/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Katy water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0018 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 6 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Total Coliform | Microbiological | 7 | 6 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 77449 | B | 1 | 0 | City of Katy |
| 77450 | B | 1 | 0 | Mason Creek Utility District |
| 77491 | A | 1 | 0 | City of Katy |
| 77492 | A | 1 | 0 | City of Katy |
| 77493 | B | 1 | 0 | City of Katy |
| 77494 | B | 1 | 0 | City of Katy |
All ZIP Codes in Katy
- 77449 [B] — 1 violation
- 77450 [B] — 1 violation
- 77491 [A] — 1 violation
- 77492 [A] — 1 violation
- 77493 [B] — 1 violation
- 77494 [B] — 1 violation
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Katy
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Katy Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Katy
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Newer construction dominates Katy's residential inventory, as reflected in a median build year of 2009. The practical implication is that lead-soldered copper plumbing joints — a pre-1986 standard now federally prohibited — are an exception rather than the rule in this city, though they remain present in the older fraction of the housing stock.
Most homes in Katy were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Katy Homeowners
In Katy, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.
Remediation costs in Katy are relatively low compared to home values. The $1,700–$3,740 estimated range is a small fraction of median property value. Home values are 50% above the Texas average.
Lead Exposure Risk for Children in Katy
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Older homes from the pre-rule era make up 16% of Katy's inventory, a contained slice. Citywide aggregate readings stay below 0.015 mg/L under EPA Lead and Copper Rule monitoring, suggesting systemic lead is not a dominant local concern. What the aggregate cannot do is reflect conditions inside any single building, where interior plumbing age, water chemistry, and stagnation patterns interact differently than they do across thousands of service connections combined into one figure.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Katy
Flood risk in Katy reaches a level where its interaction with water quality becomes a concrete planning concern rather than an abstract possibility. NFIP data records 2977 claims, and 83% of the area's ZIP codes are within FEMA-designated flood zones. At this exposure level, the mechanisms connecting major flood events to water quality disruption — treatment overload, well contamination, distribution backflow — have likely been activated repeatedly over the multi-decade NFIP tracking window.
Katy has a significant flood history with 2,977 FEMA flood insurance claims on record, averaging $70,848 per claim. With 83% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,440</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Katy, TX