HARRIS COUNTY MUD 11

HOUSTON, TX · ~3,645 people served

Check your exact address → HOUSTON overview

100

Excellent

PurityRadar safety score

PWSID

TX1010426

State

Texas

City

HOUSTON

Population served

3,645

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Feb 2025). Levels in parts per trillion (ppt).

Lithium

28,600 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2025. Official EPA record →

Other · EPA contaminant 7000 began Jul 2025 Unaddressed

Max contaminant level (MCL) · Arsenic health-based began Apr 2014 Resolved

Max contaminant level (MCL) · Arsenic health-based began Jan 2014 Resolved

Other · EPA contaminant 7500 began Jan 2009 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2008 Resolved

Recent enforcement actions

State action · SIA Dec 2025
State action · SOX Apr 2015
State action · SIF Sep 2014
State action · SIE Jun 2014
State action · SIA Jun 2014
State action · SIF Apr 2014
State action · SIA Mar 2014
State action · SIE Mar 2014

This profile is built from EPA public records for system TX1010426 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.