A93/100
NORTHWEST HARRIS COUNTY MUD 12 — Water Quality Report 2026
Serving 7,839 people · Texas
Water Source
Groundwater
County
—
System ID
TX1011901
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – June 30, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 NORTHWEST HARRIS COUNTY MUD 12
Is NORTHWEST HARRIS COUNTY MUD 12 water safe to drink?
NORTHWEST HARRIS COUNTY MUD 12 water receives a grade of A (93/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has NORTHWEST HARRIS COUNTY MUD 12 detected?
31 contaminants were tested in NORTHWEST HARRIS COUNTY MUD 12's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does NORTHWEST HARRIS COUNTY MUD 12 have any EPA violations?
Yes, NORTHWEST HARRIS COUNTY MUD 12 has 4 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other.
How many people does NORTHWEST HARRIS COUNTY MUD 12 serve?
NORTHWEST HARRIS COUNTY MUD 12 serves approximately 7,839 people, Texas.
What type of water does NORTHWEST HARRIS COUNTY MUD 12 provide?
NORTHWEST HARRIS COUNTY MUD 12 sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is TX1011901.
How does NORTHWEST HARRIS COUNTY MUD 12 compare to other utilities in Texas?
NORTHWEST HARRIS COUNTY MUD 12 scores 93/100 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.