HARRIS COUNTY MUD 391

HOUSTON, TX · ~8,835 people served

Check your exact address → HOUSTON overview

100

Excellent

PurityRadar safety score

PWSID

TX1013253

State

Texas

City

HOUSTON

Population served

8,835

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 Aug 2025). Levels in parts per trillion (ppt).

Lithium

35,400 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2015. Official EPA record →

Other · EPA contaminant 7500 began Apr 2006 Resolved

Monitoring & reporting · Total coliform began Dec 2005 Resolved

Monitoring & reporting · Total coliform began Oct 2005 Resolved

Other · EPA contaminant 7500 began May 2003 Resolved

Monitoring & reporting · Total coliform began Jan 2003 Resolved

Recent enforcement actions

State action · SOX Aug 2015
State action · SOX Jan 2011
State action · SIA Mar 2006
State action · SIF Feb 2006
State action · SIA Jan 2006
State action · SIE Jan 2006
State action · SOX Dec 2005
State action · SIE Nov 2005

This profile is built from EPA public records for system TX1013253 — 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.