NORCO, CITY OF

At a glance

3 above the safety limit, 1 detection to watch

• Above the federal safety limit

  PFHxS

  13.8 ng/L

  PFHxS is a "forever chemical" that builds up in the body. The most recent test was above the federal safety limit, and long-term exposure has been linked to cancer and other health problems.

  Most recent EPA PFAS test · See details below

• Above the federal safety limit

  PFOS

  31.4 ng/L

  PFOS is a "forever chemical" that builds up in the body. The most recent test was above the federal safety limit, and long-term exposure has been linked to cancer and other health problems.

  Most recent EPA PFAS test · See details below

• Above the federal safety limit

  PFOA

  13.7 ng/L

  PFOA is a "forever chemical" that builds up in the body. The most recent test was above the federal safety limit, and long-term exposure has been linked to cancer and other health problems.

  Most recent EPA PFAS test · See details below

• Detected — worth watching

  lithium

  0.0356 mg/L

  lithium was found at a level below the federal limit, but high enough to keep an eye on.

  Most recent EPA PFAS test · See details below

• No lead reported

  Lead service lines

  No lead reported in inventory

  This utility's inventory reports no confirmed lead service lines and a low share of unclassified lines.

  From the utility's published inventory · See details below

• This utility fluoridates

  Fluoride

  Added

  CDC's My Water's Fluoride listing reports this system adjusts fluoride to the recommended level, or buys water from a system that does.

  Per CDC My Water's Fluoride · See details below

Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.

Lead service line inventory

Inventory data sourced from NORCO, CITY OF ( retrieved May 24, 2026 ; curator confidence: high ). Confirmed against the original source automatically each month; see methodology.

Lead and copper test results

The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.

Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.

PFAS and emerging contaminants

This system was tested 420 times under EPA's latest PFAS monitoring program; 8 of the 30 chemicals tested were detected.

Data from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) , last refreshed May 24, 2026.

Fluoride

Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.

Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.

Recorded contaminant measurements (from violations)

When this system exceeded a regulatory limit and EPA recorded the measured value, that value is shown here. These are not routine sample results: they are the values the violation was triggered on.

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Compliance history

EPA-recorded violations against this system over the last 5 years.

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Where to see every contaminant this utility tested for

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Contact this utility

Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.