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WEST VALLEY WATER DISTRICT

California — Community Water System — PWSID: CA3610004

System Information

PWSIDCA3610004
System NameWEST VALLEY WATER DISTRICT
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityRIALTO
ZIP Code92377
Address855 W. BASELINE RD
OrganizationTHIEL, JOHN
Phone909-875-3706

Population & Service

Population Served104,498
Service Connections23,436

Drinking Water Violations (19)

This water system has 19 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jan 1, 2013 Dec 31, 2013 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2013 Nitrate Rule
Jan 1, 2013 Dec 31, 2013 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2013 Nitrate Rule
Oct 1, 2012 — Lead and Copper Rule MR No No — TT — Resolved Mar 1, 2018 Lead and Copper Rule
Oct 1, 2012 — Lead and Copper Rule MR No No — TT — Resolved Mar 1, 2018 Lead and Copper Rule
Jan 1, 2012 Dec 31, 2012 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2012 Nitrate Rule
Jan 1, 2012 Dec 31, 2012 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2012 Nitrate Rule
Jun 1, 1987 Jun 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Jun 30, 1987 Nitrate Rule
Jun 1, 1987 Jun 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Jun 30, 1987 Nitrate Rule
Jun 1, 1987 Jun 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Jun 30, 1987 Nitrate Rule
Jun 1, 1987 Jun 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Jun 30, 1987 Nitrate Rule
May 1, 1987 May 31, 1987 Nitrate MCL Yes No — 10 mg/L — Archived May 31, 1987 Nitrate Rule
May 1, 1987 May 31, 1987 Nitrate MCL Yes No — 10 mg/L — Archived May 31, 1987 Nitrate Rule
May 1, 1987 May 31, 1987 Nitrate MCL Yes No — 10 mg/L — Archived May 31, 1987 Nitrate Rule
May 1, 1987 May 31, 1987 Nitrate MCL Yes No — 10 mg/L — Archived May 31, 1987 Nitrate Rule
Apr 1, 1987 Apr 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Apr 30, 1987 Nitrate Rule
Apr 1, 1987 Apr 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Apr 30, 1987 Nitrate Rule
Apr 1, 1987 Apr 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Apr 30, 1987 Nitrate Rule
Apr 1, 1987 Apr 30, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Apr 30, 1987 Nitrate Rule
Mar 1, 1987 Mar 31, 1987 Nitrate MCL Yes No — 10 mg/L — Archived Mar 31, 1987 Nitrate Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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