Drinking water quality · 2022
· Verified
What's in Norco, City of — Norco, Ca, CA tap water
18 contaminants were measured in the Norco, City of — Norco, Ca, CA water system's 2022 annual report. Each is shown below against its federal limit.
- Reporting year
- 2022
- Contaminants measured
- 18
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based17 violations on record · most recent Jul 2025resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 4.4 mg/LAverageNORCO Systemwide 100% | 10 mg/LMCL | Within the limit |
+By source (4)— Arlington Desalter 66.0%, Chino Desalter 17.0%, NORCO Systemwide 100% +1 more
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.3 mg/LAverageNORCO Systemwide 100% | 4 mg/LMCL | Within the limit |
+By source (2)— Well Water 17.0%, NORCO Systemwide 100%
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.2 mg/LAverageNORCO Systemwide 100% | None set | Within the limit |
+By source (3)— Well Water 17.0%, NORCO Systemwide 100%, Arlington Desalter 66.0%
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 1 ng/LAverageNORCO Systemwide | 6.5 ng/LNL | Within the limit |
+By source (2)— Well Water, NORCO Systemwide
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0.6 ng/LAverageNORCO Systemwide | 5.1 ng/LNL | Within the limit |
+By source (2)— Well Water, NORCO Systemwide
| |||
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0.7 ng/LAverageNORCO Systemwide | 3 ng/LNL | Within the limit |
+By source (3)— Well Water, NORCO Systemwide, Arlington Desalter
| |||
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0.4 ng/LAverageNORCO Systemwide | 500 ng/LNL | Detected — no federal limit |
+By source (3)— Arlington Desalter, NORCO Systemwide, Well Water
| |||
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.3 ng/LAverageNORCO Systemwide | None set | Detected — no federal limit |
+By source (2)— Well Water, NORCO Systemwide
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.6 pCi/LAverageNORCO Systemwide 100% | 15 pCi/LMCL | Within the limit |
+By source (3)— NORCO Systemwide 100%, Well Water 17.0%, Arlington Desalter 66.0%
| |||
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 1.8 pCi/LAverageNORCO Systemwide 100% | 20 pCi/LMCL | Detected — no federal limit |
+By source (3)— Well Water 17.0%, NORCO Systemwide 100%, Arlington Desalter 66.0%
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.21 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0.5 ug/LAverageNORCO Systemwide 100% | None set | Within the limit |
+By source (2)— Well Water 17.0%, NORCO Systemwide 100%
| |||
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | Within the limit |
| BoronA naturally occurring element from rock and soil. | 638.8 ug/LAverageNORCO Systemwide | 1 ug/LNL | Detected — no federal limit |
+By source (2)— Well Water, NORCO Systemwide
| |||
| Vanadium | 4.8 ug/LAverageNORCO Systemwide | 50 ug/LNL | Detected — no federal limit |
+By source (4)— Arlington Desalter, NORCO Systemwide, Well Water +1 more
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 2.9 ug/LAverageNORCO Systemwide 100% | None set | Within the limit |
+By source (2)— Well Water 17.0%, NORCO Systemwide 100%
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 0.3 ug/LAverageNORCO Systemwide 100% | None set | Within the limit |
+By source (2)— Well Water 17.0%, NORCO Systemwide 100%
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0 %RangeArlington Desalter 66.0% | 0 %Public health goal | None detected |
+By source (3)— Arlington Desalter 66.0%, Chino Desalter 17.0%, NORCO Systemwide 100%
| |||
Source: Norco, City of — Norco, Ca, CA's 2022 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Norco, City of — Norco, Ca, CA's water
+Is Norco, City of — Norco, Ca, CA tap water safe to drink in 2022?
Every one of the 18 contaminants measured in Norco, City of — Norco, Ca, CA's 2022 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Norco, City of — Norco, Ca, CA tap water?
18 contaminants were measured in Norco, City of — Norco, Ca, CA's 2022 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and disinfection byproducts. 12 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Norco, City of — Norco, Ca, CA's 2022 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Norco, City of — Norco, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2022 report; a new report will replace it once the utility publishes its next annual update.
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