City of Norco

ZipCheckup's reading of EPA SDWIS for City of Norco (CA3310025): 1 past health-based violation, since resolved. The five-year EPA compliance file for City of Norco contains 43 violations, each documented and subsequently closed - the utility now operates in full compliance and continues to supply approximately 25,068 residents with water meeting current federal standards, including both health-based and monitoring requirements.

Data: EPA SDWIS

System Overview

City of Norco, (EPA ID: CA3310025) is a community water system in California that serves approximately 25,068 people from surface water sources.

This system provides water to 3 ZIP codes across 3 communities.

ZIP-Area Home Safety Context: D (44/100)

This is the average Home Safety Score for 1 of 3 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.

Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.

Violation History

Status breakdown for accepted records with record years 2021-2026: 42 resolved, 1 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.

Recent Violations

Contaminants Detected

The following contaminants have been flagged in EPA records for this water system:

Health Risk Details

Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)

Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.

Removal methods: granular activated carbon (GAC), carbon block filter, reverse osmosis. Find the right filter →

Lead & Copper

EPA Lead and Copper Rule evidence attributed directly to this water system:

No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.

Radon Risk in Service Area

Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

ZIP Codes Served

Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by CA or modeled from parcel and building-footprint data.

• 92503 - Riverside
• 92860 - Norco
• 92880 - Corona

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Norco (CA3310025) on EPA.gov.

Frequently Asked Questions

Is City of Norco water safe to drink?

The accepted 2026Q2 ECHO snapshot shows no current noncompliance for City of Norco; its 43 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.

How many people does City of Norco serve?

City of Norco serves approximately 25,068 people across 3 ZIP codes in California.

Where does City of Norco get its water?

The primary water source is surface water.

@misc{zipcheckup-water-system-ca3310025,
  author = {{ZipCheckup}},
  title  = {{City of Norco (CA): 1 Health Violation}},
  year   = {n.d.},
  url    = {https://zipcheckup.com/water-system/ca3310025/}
}