City water profile

Water hardness in Norco

Find official utility reports, understand hardness, and check the water system serving your home in Norco, California.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 1
Active health records: 0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →

Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

Norco, City Of

CA3310025 · Surface water · 25,068 people served system-wide

The system names this served city; Census place overlap links the city to this ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →

Measurements (2)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level

Reported level: 0 mg/L
Action level: 0.015 mg/L

0% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

TTHM

EPA SDWIS reported health-based violation

Reported violation

Reported level: 0.083 MG/L
Maximum contaminant level: 0.08 MG/L

104% of the listed benchmark

Monitoring period: Jul 1, 2025 to Sep 30, 2025

Violation history (43)

Imported violation history for Norco, City Of
Rule	Status	Period
TTHMHealth-based	Archived	Jul 1, 2025 to Sep 30, 2025
Barium	Resolved	Jan 1, 2024 to Dec 31, 2024
Cadmium	Resolved	Jan 1, 2024 to Dec 31, 2024
Chromium	Resolved	Jan 1, 2024 to Dec 31, 2024
Fluoride	Resolved	Jan 1, 2024 to Dec 31, 2024
Mercury	Resolved	Jan 1, 2024 to Dec 31, 2024
Nickel	Resolved	Jan 1, 2024 to Dec 31, 2024
Nitrite	Resolved	Jan 1, 2024 to Dec 31, 2024
Beryllium, Total	Resolved	Jan 1, 2024 to Dec 31, 2024
Antimony, Total	Resolved	Jan 1, 2024 to Dec 31, 2024
Thallium, Total	Resolved	Jan 1, 2024 to Dec 31, 2024
Selenium	Resolved	Jan 1, 2024 to Dec 31, 2024
Methoxychlor	Resolved	Jan 1, 2024 to Dec 31, 2024
Dalapon	Resolved	Jan 1, 2024 to Dec 31, 2024
Endothall	Resolved	Jan 1, 2024 to Dec 31, 2024
Glyphosate	Resolved	Jan 1, 2024 to Dec 31, 2024
Di(2-ethylhexyl) adipate	Resolved	Jan 1, 2024 to Dec 31, 2024
OXAMYL	Resolved	Jan 1, 2024 to Dec 31, 2024
Simazine	Resolved	Jan 1, 2024 to Dec 31, 2024
Dinoseb	Resolved	Jan 1, 2024 to Dec 31, 2024
Hexachlorocyclopentadiene	Resolved	Jan 1, 2024 to Dec 31, 2024
LASSO	Resolved	Jan 1, 2024 to Dec 31, 2024
2,3,7,8-TCDD	Resolved	Jan 1, 2024 to Dec 31, 2024
Heptachlor	Resolved	Jan 1, 2024 to Dec 31, 2024
2,4-D	Resolved	Jan 1, 2024 to Dec 31, 2024
2,4,5-TP	Resolved	Jan 1, 2024 to Dec 31, 2024
HEXACHLOROBENZENE	Resolved	Jan 1, 2024 to Dec 31, 2024
Benzo(a)pyrene	Resolved	Jan 1, 2024 to Dec 31, 2024
Pentachlorophenol	Resolved	Jan 1, 2024 to Dec 31, 2024
Total Polychlorinated Biphenyls (PCB)	Resolved	Jan 1, 2024 to Dec 31, 2024
ETHYLENE DIBROMIDE	Resolved	Jan 1, 2024 to Dec 31, 2024
Toxaphene	Resolved	Jan 1, 2024 to Dec 31, 2024
Endrin	Resolved	Jan 1, 2024 to Dec 31, 2024
1,2-DIBROMO-3-CHLOROPROPANE	Resolved	Jan 1, 2024 to Dec 31, 2024
Heptachlor epoxide	Resolved	Jan 1, 2024 to Dec 31, 2024
Chlordane	Resolved	Jan 1, 2024 to Dec 31, 2024
Carbofuran	Resolved	Jan 1, 2024 to Dec 31, 2024
Arsenic	Resolved	Jan 1, 2024 to Dec 31, 2024
Picloram	Resolved	Jan 1, 2024 to Dec 31, 2024
Diquat	Resolved	Jan 1, 2024 to Dec 31, 2024
BHC-GAMMA	Resolved	Jan 1, 2024 to Dec 31, 2024
Atrazine	Resolved	Jan 1, 2024 to Dec 31, 2024
Di(2-ethylhexyl) phthalate	Resolved	Jan 1, 2024 to Dec 31, 2024

City summary

What the indexed records say

Norco has 1 published ZIP profile across Riverside County. The regional-evidence median is 167 PPM. The city does not meet the stricter comparison standard.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard1 ZIP

Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 6.3 miles
Profiles with evidence: 1/1

Confidence labels

High: 1Moderate: 0Low: 0

Observation window: Mar 26, 2025 to May 14, 2026.

ZIP directory

Water reports in Norco

Open a ZIP for site-level provenance and measurements.

ZIP code

92860

Hard

167 PPM

Nearest site: 6.3 mi
Confidence: High

View full ZIP evidence →

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other California communities

Banning

Riverside County

168 PPM median

Blythe

Riverside County

530 PPM median

Coachella

Riverside County

107 PPM median

Corona

Riverside County

167 PPM median

Hemet

Riverside County

687 PPM median

Indio

Riverside County

133 PPM median

Search all 242 California cities →

Questions people ask

About water in Norco

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.