A85/100
HARRIS COUNTY MUD 257 — Water Quality Report 2026
Serving 3,501 people · Texas
Water Source
Purchased Surface Water
County
—
System ID
TX1012985
Violations
4
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 1, 2024 – August 31, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About HARRIS COUNTY MUD 257
Is HARRIS COUNTY MUD 257 water safe to drink?
HARRIS COUNTY MUD 257 water receives a grade of A (85/100), which is considered excellent. Out of 32 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has HARRIS COUNTY MUD 257 detected?
32 contaminants were tested in HARRIS COUNTY MUD 257's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does HARRIS COUNTY MUD 257 have any EPA violations?
Yes, HARRIS COUNTY MUD 257 has 4 EPA violation(s) on record, with the most recent in 2024. Violation types include MON, MR.
How many people does HARRIS COUNTY MUD 257 serve?
HARRIS COUNTY MUD 257 serves approximately 3,501 people, Texas.
What type of water does HARRIS COUNTY MUD 257 provide?
HARRIS COUNTY MUD 257 sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is TX1012985.
How does HARRIS COUNTY MUD 257 compare to other utilities in Texas?
HARRIS COUNTY MUD 257 scores 85/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Texas state page for a full comparison of water systems.