How hard is the water in Bay Point, CA?

Tap water hardness
88mg/L
5.2gpg
Moderately hard

Reported by Contra Costa Water District · October 2025

CA typical
121 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Bay Point carries roughly 88 mg/L of dissolved calcium and magnesium, or 5.2 grains per gallon. That is moderately hard water. The number comes from Contra Costa Water District, dated October 2025.

Bay Point on the hardness scale, with nearby cities
060120180240300360+CA typical 121Saranap: 34 mg/LSaranap 34Pleasant Hill: 40 mg/LPleasant Hill 40Contra Costa Centre: 40 mg/LContra Costa Centre 40Walnut Creek: 40 mg/LWalnut Creek 40Benicia: 56 mg/LBenicia 56Pittsburg: 82 mg/LPittsburg 82Antioch: 82 mg/LAntioch 82Martinez: 84 mg/LMartinez 84Concord: 86 mg/LConcord 86Clayton: 86 mg/LClayton 86Bay Point 88mg/L as calcium carbonate060120180240300360+CA 121Pleasant Hill: 40 mg/LPleasant H. 40Contra Costa Centre: 40 mg/LContra Cos. 40Pittsburg: 82 mg/LPittsburg 82Martinez: 84 mg/LMartinez 84Concord: 86 mg/LConcord 86Clayton: 86 mg/LClayton 8688 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 88 mg/L, Bay Point is 33 mg/L below the typical California figure of 121. None of the 10 nearest cities we track has harder water. The range nearby runs from 34 mg/L in Saranap to 86 in Concord.

What 88 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Bay Point

3 people × 75 gallons a day × 5.2 gpg = 1,166 grains a day. A 24,000-grain unit regenerates about every 20 days.

Size it for your household

EPA record for Bay Point's water system

Contra Costa Water District · PWSID CA0710003

No health-based violations since 2016

Serves about 210,500 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Bay Point to this system. EPA's service-area records do not name Bay Point, so check the utility printed on your water bill.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Bay Point water hard?

Somewhat. It measures about 88 mg/L (5.2 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Bay Point in grains per gallon?

About 5.2 gpg. One grain per gallon equals 17.1 mg/L, so 88 mg/L divided by 17.1 gives 5.2.

What size water softener do I need in Bay Point?

For 3 people using 75 gallons each per day, 5.2 gpg works out to about 1,166 grains a day. A 24,000-grain softener covers that with a regeneration about every 20 days.

Has the Bay Point water system had EPA violations?

EPA records show no health-based violations for Contra Costa Water District since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, October 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.