TROUT GULCH MUTUAL WATER COMPANY

APTOS, CA · ~614 people served

Check your exact address → APTOS overview

100

Excellent

PurityRadar safety score

PWSID

CA4400502

State

California

City

APTOS

Population served

614

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

Lithium

20,300 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2013. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Apr 2013 Resolved

Monitoring & reporting · Total coliform began Dec 2012 Resolved

Monitoring & reporting · Total coliform began Oct 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jul 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Nov 2007 Resolved

Monitoring & reporting · Total coliform began Mar 2005 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved

Recent enforcement actions

State action · SOX May 2013
State action · SIE May 2013
State action · SIA May 2013
State action · SOX Jan 2013
State action · SIA Jan 2013
State action · SIE Jan 2013
State action · SOX Nov 2010
State action · SIE Nov 2010

This profile is built from EPA public records for system CA4400502 — 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.