How hard is the water in Gridley, CA?

Utility-reported hardness is unavailable in this index. Regional environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Local water dashboard

Official source aggregation

Water quality in Gridley, CA 95948

Q: Is tap water safe in Gridley?

EPA SDWIS reports 1 active health-based violation record(s) among systems associated with this ZIP. Review your utility's current notice and Consumer Confidence Report.

Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Butte County.

1 active health-based record(s) across possible systems

Largest possible serving system: City Of Gridley
Source water: Groundwater
County: Butte County
Profile updated: Jun 22, 2026

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 →

At a glance

What the current records say

EPA quarter 2026Q2

Utility-reported hardness

Unavailable

Ask your provider or test your tap

All possible systems

Review needed

1 active health-based record

Measurements by utility

Choose your provider

Each result belongs to a specific system.

Utility match

1 system

Serves 7,269 people system-wide

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.

City Of Gridley

CA0410004 · Groundwater · 7,269 people served system-wide

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

1 reported active health-based record(s) for this system

Find this utility’s official report →

Measurements (1)

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, 2021 to Dec 31, 2023

Violation history (2)

Imported violation history for City Of Gridley
Rule	Status	Period
LEAD AND COPPER RULE REVISIONSHealth-based	Unaddressed	Oct 17, 2024
LEAD AND COPPER RULE REVISIONS	Unaddressed	Oct 17, 2024

Hardness meter

What does nearby environmental evidence show?

Very Hard

239.5

PPM as CaCO₃

Very Hard

PPM

239.5

GPG

Regional environmental evidence

USGS hardness classification scale

239.5 PPM

Soft
0–60Moderate
61–120Hard
121–180Very hard
181+

Parts per million

239.5

mg/L as CaCO₃ equivalent

Grains per gallon

1 GPG ≈ 17.1 PPM

How to use regional evidence

These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.

USGS sites used

Nearest site

2.3 mi

Observation range

Jul 11, 2017–Jun 5, 2023

Regional evidence confidence

Moderate

Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: 018N002E32H001M (Well).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.

Regional context

Is 95948 typical?

These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.

Gridley median

240 PPM

About the same

1 indexed ZIP readings · Range 239.5–239.5 PPM

California median

254 PPM

14 PPM lower

549 indexed ZIP readings · Range 42.6–1531.5 PPM

Evidence-first next steps

Confirm the problem before choosing treatment

This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.

Confirm the serving system

ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.

Read the current utility report

An active health-based record is present. Follow the utility's current notice and public-health instructions.

Find an official utility report →

Test for the decision you face

Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.

Convert your hardness test result →

Frequently asked

Water questions for Gridley

Is tap water safe in Gridley?+

EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.

How hard is the water?+

Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.

Do I need a water softener?+

Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.