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Water system · PWSID CA4010007

CITY OF PASO ROBLES WATER DIVISION

PASO ROBLES, CA · ~31,176 people served

Check your exact address → PASO ROBLES overview
87
Excellent
PurityRadar safety score

PWSID

CA4010007

State

California

City

PASO ROBLES

Population served

31,176

Primary source

Surface water

Score history

▼ 13 points — the score moved from 100 to 87 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 87

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

PFOA

Perfluorooctanoic acid

4.8 ppt

limit 4 ppt

Above EPA limit · 1.2×

PFHxS

Perfluorohexanesulfonic acid

4 ppt

limit 10 ppt

Below EPA limit

Lithium

40,500 ppt

limit —

No federal limit

PFPeA

17 ppt

limit —

No federal limit

PFHxA

15 ppt

limit —

No federal limit

PFBS

6.3 ppt

limit —

No federal limit

PFBA

6.1 ppt

limit —

No federal limit

PFHpA

4.7 ppt

limit —

No federal limit

Violations & enforcement

4

Violations on record

0

Unaddressed

1

Health-based

9

Enforcement actions

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

Monitoring & reporting · EPA contaminant 3014 began Jun 2015 Resolved
Monitoring & reporting · Total coliform began Apr 2008 Resolved
Monitoring & reporting · Lead & Copper Rule began Jun 1993 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jun 1993 Resolved

Recent enforcement actions

  • State action · SOX Jun 2015
  • State action · SFL Jun 2015
  • State action · SOX May 2008
  • State action · SFL May 2008
  • EPA/federal action · EOX Mar 2000
  • State action · SFJ Jan 1998
  • State action · SOX May 1997
  • State action · SOX Jan 1996

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

2 stations · latest Aug 2020

3.18 · max 6.24 mg/l as N · 4

Arsenic

2 stations · latest Aug 2020

8.65 · max 12 ug/l · 2

Fluoride

2 stations · latest Aug 2020

0.3 · max 0.3 mg/l · 2

Manganese

2 stations · latest Aug 2020

54.1 · max 104 ug/l · 2

Uranium

2 stations · latest Aug 2020

6.12 · max 7.09 ug/l · 2

Atrazine

1 station · latest Aug 2020

0.009 · max 0.009 ug/l · 1

Lead

1 station · latest Aug 2020

0.047 · max 0.047 ug/l · 1

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 CA4010007 — 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.