SAN DIEGO, CITY OF

SAN DIEGO, CA · ~1,385,379 people served

Check your exact address → SAN DIEGO overview

100

Excellent

PurityRadar safety score

PWSID

CA3710020

State

California

City

SAN DIEGO

Population served

1,385,379

Primary source

Surface water

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 2023). Levels in parts per trillion (ppt).

Lithium

33,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2020. Official EPA record →

Monitoring · Lead & Copper Rule began Apr 2020 Resolved

Monitoring · Lead & Copper Rule began Mar 2020 Resolved

Monitoring · Lead & Copper Rule began Feb 2020 Resolved

Monitoring · Lead & Copper Rule began Jan 2020 Resolved

Monitoring · Lead & Copper Rule began Dec 2019 Resolved

Monitoring & reporting · Nitrate began Jan 2017 Resolved

Monitoring & reporting · Nitrate began Jan 2014 Resolved

Monitoring & reporting · Nitrite began Jan 2014 Resolved

Monitoring & reporting · Nitrate began Jan 2013 Resolved

Monitoring & reporting · Nitrite began Jan 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Nov 2004 Resolved

Recent enforcement actions

State action · SFO Sep 2020
State action · SOX May 2020
State action · SFJ May 2020
State action · SOX Mar 2020
State action · SFJ Apr 2018
State action · SOX Jan 2018
State action · SIA Feb 2010
State action · SFL Jan 2007

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

3 stations · latest Mar 2021

1.05 · max 9.73 mg/L · 33

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 CA3710020 — 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.