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Water system · PWSID CA3610057

RIVERSIDE HIGHLAND WATER COMPANY

GRAND TERRACE, CA · ~20,188 people served

Check your exact address → GRAND TERRACE overview
24
Action needed
PurityRadar safety score

PWSID

CA3610057

State

California

City

GRAND TERRACE

Population served

20,188

Primary source

Groundwater

Score history

▼ 76 points — the score moved from 100 to 24 on Jun 18, 2026, as newly published EPA data was incorporated.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 24

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

PFOS

Perfluorooctanesulfonic acid

19 ppt

limit 4 ppt

Above EPA limit · 4.8×

PFOA

Perfluorooctanoic acid

15 ppt

limit 4 ppt

Above EPA limit · 3.8×

PFHxS

Perfluorohexanesulfonic acid

5.5 ppt

limit 10 ppt

Near EPA limit

Lithium

9,300 ppt

limit —

No federal limit

PFBA

10 ppt

limit —

No federal limit

PFPeA

9.7 ppt

limit —

No federal limit

PFHxA

5.9 ppt

limit —

No federal limit

PFHpA

5.1 ppt

limit —

No federal limit

PFBS

4.7 ppt

limit —

No federal limit

PFPeS

4 ppt

limit —

No federal limit

Violations & enforcement

2

Violations on record

0

Unaddressed

1

Health-based

6

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2024. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2024 Addressed
Max contaminant level (MCL) · Total coliform health-based began May 1998 Resolved

Recent enforcement actions

  • State action · SFL Dec 2024
  • EPA/federal action · EOX Mar 2000
  • State action · SFL Jun 1998
  • State action · SOX May 1998
  • EPA/federal action · EOX Dec 1993
  • EPA/federal action · EFJ May 1993

This profile is built from EPA public records for system CA3610057 — 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.