Tank water heaters
Calcium carbonate settles on the tank bottom over the burner. The tank rumbles, runs longer and wears out sooner. See water heater repair.
Fountain Valley plumbing service
Water softeners and filtration in Fountain Valley
Fountain Valley's City water averaged 217 ppm of hardness in 2025, about 13 grains per gallon. We size softeners to that measured number and tell you plainly what a softener, a conditioner or a filter will and will not fix.
Call (657) 669-4766Request service
Written and fact-checked by John, editor, MBA in marketing
Updated against City, utility and state sources
Quick answer
City of Fountain Valley water averaged 217 ppm total hardness in 2025, about 13 grains per gallon, with a range of 10 to 15. A salt-based ion exchange softener is the only common home system that actually removes that hardness. Salt-free conditioners and carbon filters do different jobs. Call (657) 669-4766 to size a system to your household.
- City hardness, 2025
- 217 ppm average
- In grains
- About 13 gpg (10 to 15)
- 2025 supply
- 100% groundwater
- Exact price
- Call (657) 669-4766
How hard is Fountain Valley water?
Fountain Valley City water averaged 217 parts per million of total hardness in 2025, which is about 13 grains per gallon, and the City itself calls its well water hard.
The numbers come from the City of Fountain Valley's 2026 Consumer Confidence Report, which covers water delivered in 2025. That year the City supplied only local groundwater from its wells. The City's water quality FAQ says water with 10 grains or more is generally considered hard, and that City well water is hard while imported water is moderately hard.
- Total hardness, average
- 217 ppm as calcium carbonate
- Total hardness, range
- 171 to 256 ppm
- In grains per gallon
- About 13 average, 10 to 15 range
- Calcium
- 66 ppm average (52 to 81)
- Sodium
- 41 ppm average (36 to 45)
- Total dissolved solids
- 363 ppm average (262 to 426); secondary standard 1,000
To convert, divide ppm by about 17.1 to get grains per gallon. That is how 217 ppm becomes roughly 13 grains. Softener makers size equipment in grains, so that is the number we work from. The City also notes that hardness does not affect the safety of the water. It is a plumbing and appliance issue, not a health one. Our Fountain Valley water hardness guide has the full breakdown.
Why Fountain Valley water is hard: groundwater and the GWRS
Fountain Valley draws most of its water from the Orange County Groundwater Basin, and groundwater picks up calcium and magnesium as it moves through the soil and rock of the basin.
The City's FAQ says about 85 percent of its supply is normally local groundwater, with about 15 percent imported. In 2025 it was all groundwater. The basin is managed by the Orange County Water District (OCWD), which the City's report says oversees a 350 square mile basin and tests its water quality.
Fountain Valley has always been a groundwater town. City history says the name came from the many artesian wells and the great supply of water, and that early settlers called the area the Gospel Swamps and dug drainage canals to farm it.
Today the basin is refilled partly with purified recycled water from the Groundwater Replenishment System (GWRS), a joint project of OCWD and the Orange County Sanitation District (OC San). The GWRS sits in Fountain Valley, next to OC San's Plant No. 1, which supplies the treated wastewater the GWRS purifies.
- OC San described the GWRS at 100 million gallons a day before its final expansion, rising to 130 million gallons a day, enough for about 1 million people.
- The City's 2026 report calls the GWRS the world's largest water purification system for indirect potable reuse, producing up to 130 million gallons a day.
- The same report says the GWRS helps supply about 35 percent of the water that refills the basin each year.
GWRS water itself is highly purified, but it blends with natural groundwater in the basin before it reaches City wells. What arrives at your tap is basin groundwater, and the City's own testing shows it is hard. That is the number that matters for a softener.
What 13-grain water does to Fountain Valley plumbing
Hard water leaves mineral scale wherever water is heated or evaporates, which shortens the life of water heaters and shows up on fixtures, glass and appliances.
Tankless heaters
Scale coats the narrow passages of the heat exchanger and triggers error codes. Untreated, it means descaling at least yearly. See tankless water heaters.
Faucets and showerheads
White crust on aerators and spray nozzles, stiff cartridges and slow flow. See toilets, faucets and fixtures.
Dishes and glass
The City itself notes the higher mineral content can cause white spots on glasses in the dishwasher. Shower glass spots the same way.
Water softener vs conditioner vs filter
A softener removes hardness; a salt-free conditioner changes how hardness behaves without removing it; a filter removes other things, like taste and odor, and does not soften.
Salt-based softener
- Ion exchange: resin swaps calcium and magnesium for sodium (or potassium)
- Measurably lowers hardness at the tap
- Stops scale in heaters, fixtures and appliances
- Needs salt, a drain and an outlet
- Discharges brine to the sewer when it regenerates
Salt-free conditioner
- Changes minerals so they are less likely to stick as scale
- Does not remove hardness; a test kit still reads about 13 grains
- No salt, no brine discharge, little maintenance
- Water still spots glass and leaves residue when it dries
- Results vary by product; ask for independent test data
Filter (carbon or RO)
- Carbon reduces taste, odor and disinfectant
- Reverse osmosis at the kitchen sink lowers total dissolved solids
- Whole-house carbon does not soften water
- RO is a drinking water system, not a whole-house fix
- Filters and membranes need scheduled replacement
Many Fountain Valley homes end up with two pieces: a whole-house softener at the main line for scale, and a small reverse osmosis unit under the kitchen sink for drinking water. The City's FAQ says choosing bottled water or a filter should be based on taste or other aesthetic considerations, so a drinking water filter is a preference, not a safety need.
What a water softener fixes, and what it does not
A softener fixes scale and spotting caused by hardness; it does not fix leaks, low pressure, smells, or pipes that are already failing.
A softener helps with
- Scale in tank and tankless water heaters
- White crust on faucets, showerheads and aerators
- Spots on dishes and shower glass
- Soap and shampoo that will not lather
- Scale in dishwashers, washers and ice makers
- Stretching the interval between tankless descaling
A softener does not fix
- Pinhole leaks in old copper. If they keep coming back, look at repiping
- Slab leaks under the floor. See leak detection
- Low pressure from a failing regulator or a clogged valve
- A rotten egg smell from a drain or water heater
- Scale already baked into an old tank
- Taste or odor, which is a filter's job
We say this plainly because softeners are often oversold. If the real problem is an aging water heater or a leak, a softener will not solve it, and we will tell you so before you spend the money.
How we size a water softener to Fountain Valley water
Softener size comes from your household's daily water use multiplied by the measured hardness, then matched to a capacity that regenerates about once a week.
Start with the measured hardness
The City's 2025 average was 13 grains per gallon, with a range of 10 to 15. We often test at your tap too and size toward the high end of the range so the system keeps up when hardness rises.
Estimate daily water use
Your water bill shows use per billing period. We divide that into a daily figure, or estimate from household size if the bill is not handy.
Multiply to get grains per day
For example, a household using 300 gallons a day of 13-grain water needs to remove about 3,900 grains a day.
Pick a capacity that regenerates about weekly
In that example, a week is about 27,300 grains. A unit with more rated capacity than that leaves room for growth and avoids regenerating too often.
Check flow
The valve and resin must pass enough water for peak use without a big pressure drop, especially in four and five bedroom homes.
Installing a softener in a Fountain Valley home
A whole-house softener goes on the main line after the shutoff, with a bypass valve, a drain for the brine, and an outlet for the control valve.
In most 1960s and 1970s slab homes in Fountain Valley, the main water line enters on an exterior wall or near the garage. That is usually where the softener goes, either outside on a pad with a cover, or inside the garage where the line passes through.
- Placement. We tie in after the main shutoff and before the water heater, so all hot water is softened.
- Hose bibs. Front yard irrigation and hose bibs are often left on hard water, which saves salt and keeps softened water off plants.
- Bypass valve. Lets you send hard water through the house during service or a problem.
- Drain. The brine needs an approved drain connection with an air gap, typically to a laundry standpipe or a nearby drain line.
- Power. The control valve needs an outlet.
- Permit. The City of Fountain Valley requires a permit to install or alter plumbing systems regulated by code. We confirm with the Building Division at City Hall, 10200 Slater Ave, whether your installation needs one and pull it when it does.
Condos and townhomes in east Fountain Valley may not have a single main line you control. In those cases, a compact system for your unit's own line, or a conditioner on the water heater supply, may be the practical choice, and HOA rules may apply.
California rules on softener brine discharge
California Water Code section 13148 lets certain local sewer agencies restrict self-regenerating softeners, but only after a regional water board makes a salinity finding and the agency holds a public hearing.
A self-regenerating softener flushes salty brine into the sewer each time it recharges. In parts of California where salt in recycled water or groundwater is a concern, that brine matters. Water Code 13148 defines a residential self-regenerating water softener as equipment that discharges brine into a community sewer system, and it sets the rules for limiting them.
- The law covers several hydrologic regions, including the South Coast region, plus a list of Northern California counties.
- A local agency that runs a community sewer system or water recycling facility can act only after a regional water board finds, at a public hearing, that controlling residential salt will help meet water quality objectives.
- The agency must then adopt an ordinance or resolution after its own public hearing.
- Possible measures range from requiring high-efficiency certified models or plumbing permits, to banning new installations or requiring removal with compensation.
- The law does not restrict portable exchange softeners, where a service company swaps resin tanks and regenerates them off site.
OC San supplies the treated wastewater that feeds the GWRS, so salt sent down the sewer is not just a distant concern here. Before installing, we check for any current City or OC San rules that apply. If salt discharge concerns you, a high-efficiency demand-initiated softener uses less salt, and a portable exchange service sends no brine down your drain.
Softener salt and maintenance
Keep the brine tank stocked with salt, check it monthly, and have the system looked at every year or two.
- Check salt monthly. Keep the level above the water line in the brine tank.
- Watch for salt bridges. A hard crust can form over empty space. Press gently with a broom handle to break it.
- Use clean softener salt. Pellet or solar salt suits most units; potassium chloride is an option if you want to avoid sodium.
- Test the water now and then. Inexpensive test strips show whether softened water is near zero grains.
- Reset the clock after power outages on timer-based units.
- Service the system every year or two: check the valve, injector and resin, and clean the brine tank.
On sodium: the City reports 41 ppm of sodium already in 2025 water. Softening adds more in proportion to the hardness removed. If anyone in the house is on a low-sodium diet, use potassium chloride, or keep the kitchen cold tap on a reverse osmosis unit for drinking and cooking.
What a water softener costs in Fountain Valley
Softener prices depend on type, capacity and plumbing changes, so we price each home in writing. Call (657) 669-4766 for an exact quote.
That is a published third-party estimate, not our price. The equipment itself varies widely by capacity, valve type and brand, and installation cost depends on where the main line is, whether a drain and outlet are close by, and whether a permit is needed. You get a written price for equipment and installation before work starts. For other published figures, see our Fountain Valley plumbing costs guide.
We install and service softeners across the city, from north Fountain Valley tracts near Los Amigos High to homes around Mile Square Park.
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Questions Fountain Valley homeowners ask
How hard is the water in Fountain Valley?
City of Fountain Valley water averaged 217 ppm of total hardness in 2025, about 13 grains per gallon, with a range of 10 to 15. The City's FAQ says water with 10 grains or more is generally considered hard.
Do I need a water softener in Fountain Valley?
You do not need one for safety; the City says hardness does not affect water safety. But at about 13 grains per gallon, a softener reduces scale in water heaters, fixtures and appliances, and many homeowners find it worth it, especially with a tankless heater.
What size water softener do I need for 13 grain water?
Multiply your daily water use by the hardness. A household using 300 gallons a day of 13-grain water removes about 3,900 grains a day, or about 27,300 a week. Choose a softener with more rated capacity than that so it regenerates about weekly.
Is a salt-free water conditioner the same as a softener?
No. A salt-free conditioner changes how minerals behave so they scale less, but it does not remove hardness. A test kit will still read about 13 grains. Only an ion exchange softener actually lowers hardness at the tap.
Are water softeners banned in Orange County?
California Water Code 13148 lets some local sewer agencies restrict self-regenerating softeners, but only after a regional water board finding and public hearings. Before we install, we check for current City of Fountain Valley or OC San rules that apply to your home.
Where does Fountain Valley's water come from?
Normally about 85 percent is local groundwater from the Orange County Groundwater Basin, managed by OCWD, and about 15 percent is imported. In 2025 the City delivered only groundwater. The basin is partly refilled by the GWRS, which is located in Fountain Valley.
Will a water softener fix my pinhole leaks?
No. A softener prevents new scale but does not repair aging copper pipe. Recurring pinhole leaks in a 1960s or 1970s home usually point to repiping. A softener can help protect new pipes and fixtures afterward.
How much does a water softener cost in Fountain Valley?
Prices vary with softener type, size and whether a loop and drain already exist. We do not publish a single figure because no two installs are the same. Equipment size and installation details change the price, and you get a written price before work starts. Call (657) 669-4766 for an exact quote.
Sources
Facts on this page come from these public sources, checked October 31, 2026.
- City of Fountain Valley 2026 Consumer Confidence Report (2025 data)
- City of Fountain Valley, Water Quality Reports and FAQs
- City of Fountain Valley history
- City of Fountain Valley Building Division
- OC San, the Groundwater Replenishment System final expansion
- California Water Code section 13148
- This Old House, Fountain Valley plumbing costs