Ventura hard water: hardness by neighborhood and its effect on plumbing

By Steve, owner of Steve's Plumbing Ventura, a licensed plumbing contractor. Data checked against Ventura Water's 2024 Consumer Confidence Report.

Ventura's tap water is very hard, ranging from 15 grains per gallon on the Lake Casitas supply to an average of 37 grains per gallon on the groundwater that serves East and Midtown Ventura, according to Ventura Water's 2024 Consumer Confidence Report.

How hard is Ventura's water?

Ventura Water relies only on local supplies, and it blends three sources depending on availability. Each source has a different hardness, so your water depends on where you live in Ventura.

Source: Ventura Water 2024 Consumer Confidence Report, featuring calendar year 2023 results. One grain per gallon equals about 17.1 parts per million.

Is Ventura's water hard compared with other places?

Yes. The Water Quality Association classes water above 10.5 grains per gallon (180 ppm) as very hard. Ventura's softest source is above that line, and its groundwater averages more than three times it.

What's in Ventura's water besides hardness

• Calcium: 142 ppm average in the distribution system, the main scale-forming mineral.
• Magnesium: 25 to 51 ppm average depending on source.
• Total dissolved solids: 420 ppm (Casitas) to 1,376 ppm (groundwater) on average.
• Chloramine: the disinfectant, with a highest running annual average of 2.3 ppm.
• pH: 7.5 average.

The report rates Ventura's water as non-corrosive, with an aggressive index above 12. That's good news for pipe walls, but it's the same chemistry that lets scale deposit readily.

What hard water does to plumbing

Hard water damages plumbing by leaving calcium carbonate scale wherever water is heated or evaporates. Heat speeds it up, so hot water equipment suffers most.

• Tank water heaters: scale settles on the tank bottom, insulates the water from the burner, wastes gas and causes popping sounds. Water heater service.
• Tankless water heaters: scale narrows the heat exchanger and triggers error codes and temperature swings. Tankless descaling.
• Electric elements: crusted elements overheat and burn out.
• Faucets, valves and showerheads: cartridges stiffen and aerators clog.
• Toilets: fill valves stick and rim jets clog, weakening the flush.
• Appliances: dishwashers and washing machines lose efficiency.

Signs of hard-water damage in your home

• White, chalky crust on faucets and showerheads.
• Spots on glassware and shower doors.
• Popping or rumbling from the water heater.
• Falling pressure from a single showerhead or faucet.
• Soap that won't lather and a film on skin after showering.

How to check your own water hardness

1. Read the latest Consumer Confidence Report. Ventura Water publishes it each year; look for "Hardness" under the secondary standards table.
2. Work out your likely source. East Ventura homes mainly receive groundwater; West Ventura homes mainly receive river and lake water; Midtown can receive all three.
3. Test your tap. Hardness test strips from a hardware store give a reading in minutes. We test on site before sizing any treatment system.

How to treat hard water in Ventura

Treatment depends on whether you want truly soft water, scale protection only, or better taste.

• Salt-based softener: removes hardness by ion exchange. The most complete fix.
• Exchange-tank softener: soft water with no brine discharged at the home.
• Salt-free conditioner: reduces scale formation without salt; water isn't technically soft.
• Catalytic carbon filter: removes chloramine taste and odor; doesn't reduce hardness.

Compare the options on our water softener installation page.

Hard water maintenance if you don't treat it

• Flush a tank water heater once a year.
• Descale a tankless water heater once a year, or more often on groundwater.
• Soak aerators and showerheads in white vinegar every few months.
• Check the water heater anode rod every 2 to 3 years.