Water Hardness in Knights Landing, CA

Q: Do I need a water softener in Knights Landing, CA?

With a citywide weighted average hardness of 191 PPM, a water softener is recommended for homes in Knights Landing. A water softener is recommended to protect your plumbing and appliances.

Q: How many water systems serve Knights Landing, CA?

Knights Landing, California has 4 matched water systems across 1 zip code.

California · 1 zip codes · 4 matched water systems

49 PPM

2.8 GPG

Soft

0Soft60120180300+

Verified — State Lab Tested

City avg (weighted): 191 PPM

Dataset updated March 9, 20264 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

City Of West Sacramento

CA5710003

Water source: surface water

Source year: 2024

Serves: 53,355

USGS environmental estimate: 108 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 4 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

1 verified treated-water source

4 matched systems total for this city; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. 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 in Knights Landing

These systems are matched to Knights Landing, CA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

4 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
City Of Davis CA5710001	surface water	251 PPM Very Hard	67,457	High Confidence — USGS Monitoring
City Of Woodland CA5710006	surface water	202 PPM Hard	61,462	High Confidence — USGS Monitoring
City Of West Sacramento CA5710003	surface water	49 PPM Soft USGS estimate: 108 PPM	53,355	Verified — State Lab Tested(2024)
Uc - Davis CA5710009	surface water	251 PPM Very Hard	49,616	High Confidence — USGS Monitoring

City Of Davis

CA5710001

Very Hard

251 PPMsurface water67,457 servedHigh Confidence — USGS Monitoring

City Of Woodland

CA5710006

Hard

202 PPMsurface water61,462 servedHigh Confidence — USGS Monitoring

City Of West Sacramento

CA5710003

Soft

49 PPMsurface water53,355 servedVerified — State Lab Tested

Source water: 108 PPM

Uc - Davis

CA5710009

Very Hard

251 PPMsurface water49,616 servedHigh Confidence — USGS Monitoring

Zip Codes in Knights Landing, CA

95645191

What This Means For You

Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft 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 Knights Landing, CA.

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Frequently Asked Questions

How hard is the water in Knights Landing, CA?

The citywide weighted average water hardness in Knights Landing, CA is 191 PPM (11.2 GPG), classified as hard. This is based on 4 matched water systems. The gauge highlights City Of West Sacramento, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Knights Landing, CA?

With a citywide average hardness of 191 PPM, a water softener is recommended for homes in Knights Landing. Confirm your tap reading before sizing equipment.

Is hard water in Knights Landing, CA 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 Knights Landing, CA?

Knights Landing, California is served by 4 matched water systems across 1 zip code.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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