Where does the water in 95973 come from?

Water for zip code 95973 in Richardson Sprin, California is provided by 9 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 95973

Richardson Sprin, California · Butte County

198 PPM

11.6 GPG

Hard

0Soft60120180300+

Verified - State Lab Tested

Dataset updated March 9, 2026Matched to 9 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 9 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

2 verified treated-water sources

9 matched systems total for this ZIP; treated-water reports are prioritized when available.

Water source profile

Primarily groundwater

Groundwater commonly picks up calcium and magnesium after contact with rock and soil. This profile is weighted by known population served across matched systems.

Data recency

Report years 2024

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 95973

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

9 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Cal-Water Service Co.-Chico CA0410002	groundwater	250 PPM Very Hard	114,925	High Confidence - USGS Monitoring
South Feather W&P - Miners Ranch CA0410006	surface water	155 PPM Moderately Hard	22,664	High Confidence - USGS Monitoring
Thermalito Water & Sewer Dist CA0410008	surface water	36 PPM Soft USGS estimate: 155 PPM	12,136	Verified - State Lab Tested(2024)
Cal-Water Service Co.-Oroville CA0410005	surface water	35 PPM Soft USGS estimate: 192 PPM	11,106	Verified - State Lab Tested(2024)
Del Oro Water Co.-Paradise Pines CA0410011	surface water	105 PPM Slightly Hard	10,940	Estimated - County Avg

Cal-Water Service Co.-Chico

CA0410002

Very Hard

250 PPMgroundwater114,925 servedHigh Confidence - USGS Monitoring

South Feather W&P - Miners Ranch

CA0410006

Moderately Hard

155 PPMsurface water22,664 servedHigh Confidence - USGS Monitoring

Thermalito Water & Sewer Dist

CA0410008

Soft

36 PPMsurface water12,136 servedVerified - State Lab Tested

Source water: 155 PPM

Cal-Water Service Co.-Oroville

CA0410005

Soft

35 PPMsurface water11,106 servedVerified - State Lab Tested

Source water: 192 PPM

Del Oro Water Co.-Paradise Pines

CA0410011

Slightly Hard

105 PPMsurface water10,940 servedEstimated - County Avg

Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

96092145 95926198 95942198 95951250 95928198 95954198 95969194 96090144 96055141 95978198 95938199 96035144

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

Methodology Data sources How to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Richardson Sprin, CA (95973).

Submit Your Data

Frequently Asked Questions

Is the water hard in Richardson Sprin, CA (95973)?

The average water hardness in 95973 is 198 PPM (11.6 GPG), which is classified as hard.

Do I need a water softener in 95973?

With hardness of 198 PPM, a water softener is recommended for homes in 95973.

Is hard water in 95973 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 95973?

Zip code 95973 in Richardson Sprin, California is served by 9 water systems.