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Hard water and grout in Camarillo: what each supply does to tile

Camarillo’s tap water is hard on the U.S. Geological Survey scale, and some wells, and Oxnard’s system, run very hard. That is why shower tile here collects a white film and the grout darkens. At national rates, cleaning runs $0.50–$3 per square foot.

Published
Updated
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About 5 minutes
Reviewed by
Chris Szetela, founder of Maid VIP

Maid VIP estimate: about $0.50–$3 per square foot. Services fulfilled by our affiliated service partner, Maid VIP. Covered: Old Town Camarillo, Mission Oaks, Spanish Hills and Las Posas, Leisure Village, Camarillo Heights, Camarillo Springs, Oxnard. Call (805) 793-0293

Who supplies Camarillo’s water

Camarillo has more than one water supplier, and the bill names yours. The City of Camarillo serves about two-thirds of Camarillo’s residents. Camrosa Water District serves eastern Camarillo, mainly Mission Oaks, and the Santa Rosa Valley; its 2025 water plan also lists Leisure Village and the Camarillo Springs and Adolfo Camarillo mobile home parks among the master-metered communities in its area. California American Water serves Las Posas Estates, and Pleasant Valley Mutual Water Company serves homes in the Camarillo Heights area. Next door, Oxnard runs its own system. Look up your area to see the supplier its page names and, where this site has a figure, how hard that supplier’s water ran.

How hard each source runs

SourceHardnessUSGS rating
City of Camarillo, imported water148 mg/L on average, 143 to 153 (about 8.6 grains per gallon), in 2024Hard
City of Camarillo, its wells with the desalter168 mg/L on average, 78 to 354, with the desalter (about 9.8 grains per gallon), in 2024Hard on average
Camrosa Water District, imported water and its reverse osmosis plant140 and 132 mg/L, in 2025Hard
Camrosa Water District, its GAC treatment plant276 mg/L, in 2025Very hard
Camrosa Water District, its wells404 to 572 mg/L, in 2025Very hard
City of Oxnard, whole system419 mg/L on average across the system, 131 to 930 (about 24 grains per gallon), in 2025Very hard

The U.S. Geological Survey calls water of 121 to 180 milligrams per liter hard and anything above 180 milligrams per liter very hard. In 2024 the City delivered about 62% local groundwater from the Fox Canyon Aquifer, pumped by four city wells, two of which feed the North Pleasant Valley Desalter, and about 38% imported water, in 2024; the imported share is State Water Project and Colorado River water treated at the Metropolitan Water District of Southern California’s Jensen plant and delivered by the Calleguas Municipal Water District. Camrosa’s 2025 mix was about 55% from nine local wells and the rest imported through Calleguas, in 2025, and Oxnard’s 31% City wells, 36% groundwater from the United Water Conservation District and 33% imported through Calleguas, in 2025.

Hardness scale from soft to very hard: the City of Camarillo’s imported water at 143 to 153 mg/L, averaging 148, and its wells with the desalter at 78 to 354, averaging 168, both in the hard band; the City of Oxnard’s water at 131 to 930, averaging 419, in the very hard band.
On the U.S. Geological Survey scale, both of the City of Camarillo’s sources averaged hard in 2024 (148 mg/L imported, 168 from its wells with the desalter), and Oxnard’s system very hard in 2025 (419). From the two cities’ water quality reports.

What the desalter changed

The City built the North Pleasant Valley Groundwater Desalter, near Las Posas Road and Lewis Road, to turn brackish groundwater the City could not use into drinking water, and to take salts out of the watershed. It is designed to produce about 3,800 acre-feet of drinking water a year, and it began producing drinking water in January 2023. A desalter strips most of the dissolved minerals out of the water it treats. In the City’s 2024 report, its well water, with the desalter, averaged 168 mg/L, within a range of 78 to 354.

It doesn’t make Camarillo’s water soft. The average is still hard, and what comes out of a given tap depends on the blend reaching that street. Tile still needs the habits below.

What the minerals do to tile and grout

Hard water, as it dries, leaves a white film of calcium and magnesium behind, and mixed with soap it turns into a scum that takes the shine off the glaze. Because cement grout is porous, it takes in minerals and soil alike and darkens, worst of all in showers but also along the kitchen and entry paths. The lowest rows of shower tile go first, because that is where water stands longest.

Section through a tiled floor: glazed tiles on a mortar bed with recessed grout lines between them; a thin mineral film sits on the tile surface, soil and minerals sit in the porous grout, and a sealer layer tops one grout line.
A cut through a tiled floor. Minerals from hard water dry as a film on the glazed tile, the porous cement grout takes in soil and minerals, and a sealer slows how much gets in. Not to scale.
Illustration of a tiled shower in a 1970s bathroom: white square ceramic tile with chalky white mineral film on the lower rows, a ring of tan buildup around the drain, and grout lines darkened by soil.
Illustration: chalky hard-water film on the lower rows of shower tile, above grout gone dark.

Getting the film and the soil off

On HomeAdvisor’s figures, professional tile and grout cleaning is priced at $0.50–$3 per square foot. Some companies quote one price for the whole room: $300–$500 for a room of 150 to 250 square feet. Others add a $100–$200 call-out minimum. By the square foot, a 60-square-foot bathroom floor works out to $30 to $180, little enough that a call-out minimum can set the price, and 400 square feet across a kitchen, entry and hall adds up to $200 to $1,200.

National figures, not quotes: the cleaning company sets the price for your home before any work.

Sealing and color sealing

A sealer on clean grout means minerals and soil take longer to work their way back in. On Fixr’s figures, $0.90–$1.73 per square foot covers a standard grout sealant; cleaning and sealing together come to $1.50–$2.50 per square foot. Color sealing adds a tint as it seals, giving the grout one even shade and hiding old stains; grout recoloring costs $1–$2.50 per square foot on HomeAdvisor’s figures. Stanley Steemer says freshly sealed tile can be walked on after 30 minutes and takes about 24 hours to cure.

Travertine and marble

Because travertine and marble are calcium carbonate, an acidic cleaner, the kind that clears hard-water film from ceramic tile, etches them and leaves dull marks. Stone gets pH-neutral, stone-safe products and is priced separately from ceramic and porcelain.

Slowing the film down

  • Squeegee or towel the shower walls after use, so the water doesn’t dry on them
  • Keep the bathroom fan running through the shower and for a while afterward
  • Clean grout, and any stone, with a pH-neutral cleaner
  • Reseal on whatever schedule the sealer’s maker sets
  • A water softener strips most of the calcium and magnesium from the water, so new film is much slower to build, though the softener won’t remove film already there

Sources

The cleaning prices on this page are national figures, read in October 2026 in the price guides listed below; none is a quote, and no Camarillo average turned up in the price guides checked. Facts about Camarillo come from the local pages listed.

Common questions

Is Camarillo’s water hard or soft?

Hard. The City of Camarillo’s imported water averaged 148 mg/L and its well water 168 mg/L in 2024, both hard on the U.S. Geological Survey scale; Camrosa’s wells and Oxnard’s system run very hard.

Did the desalter make the water soft?

No. It strips most minerals from the groundwater it treats, but the blend reaching homes still averaged in the hard range in the City’s 2024 report, so shower tile still collects mineral film.

Why does the bottom of the shower look worst?

Water runs down and stands longest on the lowest rows of tile and the grout around the drain, so more minerals dry there. A squeegee after each shower slows it.

Ask for a cleaning price

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Call (805) 793-0293

Services fulfilled by our affiliated service partner, Maid VIP.