PWSID
CA4110023
State
California
City
SAN BRUNO
Population served
42,631
Primary source
SWP
Score history
No change since tracking began Jun 18, 2026.
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 Apr 2025). Levels in parts per trillion (ppt).
Lithium
33,000 ppt
limit —
Violations & enforcement
1
Violations on record
0
Unaddressed
0
Health-based
2
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Feb 2018. Official EPA record →
Recent enforcement actions
- State action · SOX Feb 2018
- State action · SIA Mar 2011
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.
Nitrate
1 station · latest Apr 2022
Arsenic
1 station · latest Apr 2022
Fluoride
1 station · latest Apr 2022
Manganese
1 station · latest Apr 2022
Uranium
1 station · latest Apr 2022
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 CA4110023 — 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.