Is Norco, CA tap water safe?
Supplied by City of Norco · serves 25,068 people (7,100 connections) · Purchased surface water · EPA ID CA3310025
Data: U.S. EPA · How we read the data · How we check it
Most of Norco gets its water from City of Norco. Parts of the city are served by a smaller system: California Rehabilitation Center – Norco Water System (750 people). Your water bill names your system.
Buys water from City of Riverside, Jurupa Community Services District, Western Municipal Water District (Arlington), Chino Basin Desalter Authority – Desalter 2, City of Corona. Treated water bought from another system can carry that system's contaminants.
Summary
PFAS above the 2024 federal limits. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFOA, PFOS above the federal limit in EPA's 2023–2025 testing (PFOA 10.5 ppt vs a limit of 4 ppt, PFOS 22.4 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lithium
- Above screening levelHighest result 35.9 ppb. EPA uses 10 ppb to decide what to study further. It is not a health limit, and there is no federal limit for lithium. About 1 in 4 systems tested were above it.
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2024. Your home's pipes can make yours higher.
- Violations
- Resolved1 health-based violation since 2016, most recently Jul 2025.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read City of Norco's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (951) 270-5677. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 6 entry points tested Sep 2023 to Jun 2024. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Above limit Limit 4 ppt | 10.5 ppt 2.63× the limit |
| PFOS Above limit Limit 4 ppt | 22.4 ppt 5.6× the limit |
| PFHxS Rounds to the limit Limit 10 ppt | 10.1 ppt at the limit |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Not detected Limit 10 ppt | – |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Rounds to the limit Limit 1 | 1.02 |
| PFBS Detected, below limit Guideline 2,000 ppt | 8.45 ppt |
| PFBA Detected, below limit Guideline 6,000 ppt | 12.9 ppt |
| PFHxA Detected, below limit Guideline 3,000 ppt | 5.4 ppt |
| PFPeA Detected, no limit | 8.35 ppt |
Why "rounds to the limit"? the PFHxS average (10.1 ppt) and the Hazard Index (1.02) are slightly above the number on paper, but EPA compares results after rounding to the limit's precision (4.4 ppt rounds to 4), so they meet the limit as EPA applies it. Close enough to the limit to be worth watching.
For context: the PFOA average is higher than at 96% of the California systems EPA tested and the PFOS average is higher than at 97% of the California systems EPA tested.
29 PFAS tested, 7 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Detected in 8 of 14 samples. Highest result 35.9 ppb. EPA's non-enforceable screening level is 10 ppb. Above screening level The screening level is how EPA decides what to study further, not a health limit. There is no federal limit for lithium and no filter is certified to remove it. About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2022 – Dec 2024). Below action level
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2022 – Dec 2024 | 0 ppb |
| Jan 2019 – Dec 2021 | 0 ppb |
| Jan 2016 – Dec 2018 | 0 ppb |
Earlier results (9)
| Jan 2013 – Dec 2015 | 0 ppb |
| Jan 2010 – Dec 2012 | 5.3 ppb |
| Jan 2007 – Dec 2009 | 0 ppb |
| Jan 2006 – Dec 2006 | 10 ppb |
| Jan 2004 – Dec 2006 | 10 ppb |
| Jan 2003 – Dec 2005 | 0 ppb |
| Jan 2003 – Dec 2003 | 10 ppb |
| Jan 2001 – Dec 2003 | 0 ppb |
| Jan 1999 – Dec 2001 | 8.5 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
| When | What happened |
|---|---|
| Jul 2025 | The running annual average for TTHM was above the legal limit. EPA record: TTHM · Maximum Contaminant Level Violation, Average · measured 0.083 mg/l (limit 0.080 mg/L) Resolved |
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Earlier EPA testing (2013–2020)
| Contaminant | Highest | Guideline |
|---|---|---|
| Manganese | 420 ppb | 300 ppb |
| 1,4-Dioxane | 0.35 ppb | 0.35 ppb |
| Chromium-6 | 1.1 ppb | – |
| Molybdenum | 28 ppb | 40 ppb |
| Strontium | 0.74 ppm | 1.5 ppm |
| Chlorate | 300 ppb | 210 ppb |
| Vanadium | 5.6 ppb | 21 ppb |
Where it serves
Norco
ZIP codes the system reported serving: 92860
Nearby utilities
- City of Corona Corona · 4 mi
- City of Chino Chino · 7 mi
- Jurupa Community Services District Jurupa Valley · 7 mi
- Cucamonga Valley Water District Ontario · 8 mi
- Ontario Municipal Utilities Company Ontario · 8 mi · PFAS above limit
- City of Riverside Riverside · 9 mi
Questions
Is Norco tap water safe to drink?
Most of Norco gets its water from City of Norco. City of Norco had 1 health-based violation since 2016, all since resolved. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does Norco water have PFAS?
Yes. EPA's 2023–2025 testing of City of Norco found 7 PFAS at least once. The highest entry-point averages were above the federal limit for PFOA and PFOS: PFOA 10.5 ppt, PFOS 22.4 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in Norco water?
The most recent 90th-percentile lead result for City of Norco is 0 ppb, for the period ending Dec 2024. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for CA3310025: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID CA3310025).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask City of Norco at (951) 270-5677, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.