PWSID
CA3310031
State
California
City
RIVERSIDE
Population served
298,398
Primary source
GU
Score history
▼ 8 points — the score moved from 100 to 92 on Jun 18, 2026, as newly published EPA data was incorporated.
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 Nov 2023). Levels in parts per trillion (ppt).
PFOS
Perfluorooctanesulfonic acid
4 ppt
limit 4 ppt
Lithium
9,100 ppt
limit —
PFPeA
3.3 ppt
limit —
PFHxA
3.2 ppt
limit —
Violations & enforcement
No violations are on record for this system in EPA’s SDWIS/ECHO data.
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
2 stations · latest May 2022
Arsenic
2 stations · latest May 2022
Fluoride
2 stations · latest May 2022
Uranium
2 stations · latest May 2022
Atrazine
1 station · latest May 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 CA3310031 — 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.