How hard is the water in Fallbrook, CA?

Tap water hardness
119mg/L
6.9gpg
Moderately hard

Reported by Fallbrook PUD · June 2025

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

The water in Fallbrook carries roughly 119 mg/L of dissolved calcium and magnesium, or 6.9 grains per gallon. That is moderately hard water. The number comes from Fallbrook PUD, dated June 2025.

Fallbrook on the hardness scale, with nearby cities
060120180240300360+CA typical 121Wildomar: 111 mg/LWildomar 111Camp Pendleton Mainside: 117 mg/LCamp Pendleton Mainside 117Camp Pendleton South: 117 mg/LCamp Pendleton South 117French Valley: 120 mg/LFrench Valley 120Murrieta: 132 mg/LMurrieta 132Temecula: 139 mg/LTemecula 139Oceanside: 172 mg/LOceanside 172San Marcos: 178 mg/LSan Marcos 178Vista: 213 mg/LVista 213Valley Center: 223 mg/LValley Center 223Fallbrook 119mg/L as calcium carbonate060120180240300360+CA 121Camp Pendleton Mainside: 117 mg/LCamp Pendl. 117Camp Pendleton South: 117 mg/LCamp Pendl. 117Murrieta: 132 mg/LMurrieta 132Temecula: 139 mg/LTemecula 139Oceanside: 172 mg/LOceanside 172Vista: 213 mg/LVista 213119 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Fallbrook sits close to the typical California figure of 121 mg/L. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 111 mg/L in Wildomar to 223 in Valley Center.

What 119 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 Fallbrook

3 people × 75 gallons a day × 6.9 gpg = 1,562 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for Fallbrook's water system

Fallbrook PUD · PWSID CA3710008

No health-based violations since 2016

Serves about 35,237 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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 Fallbrook water hard?

Somewhat. It measures about 119 mg/L (6.9 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Fallbrook in grains per gallon?

About 6.9 gpg. One grain per gallon equals 17.1 mg/L, so 119 mg/L divided by 17.1 gives 6.9.

What size water softener do I need in Fallbrook?

For 3 people using 75 gallons each per day, 6.9 gpg works out to about 1,562 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the Fallbrook water system had EPA violations?

EPA records show no health-based violations for Fallbrook PUD since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, June 23, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.