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Water system · PWSID CA0910002

SOUTH TAHOE PUD - MAIN

SOUTH LAKE TAHOE, CA · ~100,000 people served

Check your exact address → SOUTH LAKE TAHOE overview
62
Fair
PurityRadar safety score

PWSID

CA0910002

State

California

City

SOUTH LAKE TAHOE

Population served

100,000

Primary source

Groundwater

Score history

▼ 38 points — the score moved from 100 to 62 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 62

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).

PFOA

Perfluorooctanoic acid

6.1 ppt

limit 4 ppt

Above EPA limit · 1.5×

PFOS

Perfluorooctanesulfonic acid

5.2 ppt

limit 4 ppt

Above EPA limit · 1.3×

PFHxS

Perfluorohexanesulfonic acid

5.8 ppt

limit 10 ppt

Near EPA limit

Lithium

26,300 ppt

limit —

No federal limit

PFPeA

22 ppt

limit —

No federal limit

PFHxA

16 ppt

limit —

No federal limit

PFHpA

6.5 ppt

limit —

No federal limit

PFBA

5.3 ppt

limit —

No federal limit

PFBS

3.7 ppt

limit —

No federal limit

Violations & enforcement

7

Violations on record

0

Unaddressed

5

Health-based

11

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2008. Official EPA record →

Max contaminant level (MCL) · Arsenic health-based began Apr 2008 Resolved
Monitoring & reporting · Arsenic began Apr 2008 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2008 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2007 Resolved
Max contaminant level (MCL) · Total coliform health-based began Mar 1993 Resolved
Max contaminant level (MCL) · EPA contaminant 2987 health-based began Jan 1990 Resolved
Monitoring & reporting · Combined radium-226/228 began Jan 1990 Resolved

Recent enforcement actions

  • State action · SOX Oct 2008
  • State action · SOX Feb 2008
  • EPA/federal action · EOX Mar 2000
  • State action · SOX Jan 1997
  • State action · SOX Jan 1997
  • State action · SFK Nov 1994
  • EPA/federal action · EOX Dec 1993
  • State action · SOX Aug 1993

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

1 station · latest Aug 2020

0.005 · max 0.005 mg/L · 3

Arsenic

2 stations · latest Jun 2022

6.1 · max 10.7 ug/l · 2

Fluoride

2 stations · latest Jun 2022

0.02 · max 0.02 mg/l · 2

Manganese

1 station · latest Jun 2025

0.9 · max 0.9 mg/L · 2

Uranium

2 stations · latest Jun 2022

2.25 · max 2.53 ug/l · 2

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system CA0910002 — 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.