San Fernando Valley Water, Pipes and Quake Prep

Who supplies water in the San Fernando Valley?

San Fernando Valley water comes from four public suppliers, and your address decides which one. LADWP serves the City of Los Angeles side of the Valley; its 2025 water quality report lists 30 Valley communities, among them Van Nuys, North Hollywood, Sherman Oaks, Reseda, Northridge, Sylmar and Woodland Hills. Burbank, Glendale and the small City of San Fernando run their own systems.

The sources differ more than the names suggest. LADWP's 2025 water was 44% Los Angeles Aqueduct, 52% bought from the Metropolitan Water District, 3% recycled and 1% local groundwater. Glendale drew 31.3% from the San Fernando groundwater basin, and San Fernando pumps wells in the Sylmar Basin. The tap water folder and the water sources page follow each supply from mountain or well to meter.

How hard is San Fernando Valley water?

Hardness in San Fernando Valley water runs from moderately hard to very hard, depending on the supplier. On LADWP water, 2025 averages were 103 mg/L at the aqueduct filtration plant, 140 in MWD Jensen water and 115 from the northern wells, roughly 6.0 to 8.2 gpg. Burbank's blend came in at 286 mg/L (16.7 gpg), and San Fernando's own wells at 190 mg/L, roughly 11.1 gpg.

Glendale has no single figure: its groundwater plant measured 350 mg/L and the imported water it buys 140 to 234 mg/L. On the USGS hardness scale, anything above 180 mg/L is very hard. Hardness is about scale on fixtures and heaters, not safety, which the City of San Fernando's report states plainly. The hardness page breaks it down by source.

Is San Fernando Valley tap water safe to drink?

By the 2025 reports, yes: none of the four suppliers reported a violation of a primary, health-based standard. Chloramine keeps the water disinfected on its way to you; LADWP's residual averaged 1.7 mg/L against a limit of 4. LADWP tells dialysis patients and owners of aquariums or fish ponds to take it out first.

The open questions sit on your side of the meter. LADWP's water quality page reports no lead service lines anywhere in its system, yet 3 of 105 homes sampled in 2023 topped 15 ppb because of solder and brass inside them. Read the safety results, the lead page and the chloramine page for the details.

What should owners of older Valley homes know about their pipes?

Know where your responsibility starts: at the meter box near the curb. LADWP's water service guide puts every pipe on the house side of the meter on the customer, so the buried service line and the house shutoff valve are yours. The 2025 California Plumbing Code allows copper, PEX, CPVC and galvanized steel, among others, for water lines inside a house.

Old galvanized pipe rusts inside, and EPA notes that lead particles can cling to its walls where lead once ran upstream. Pressure matters too: the 2025 California Plumbing Code calls for a regulator once static pressure from the street goes above 80 psi. Leaks add up quietly: the average household loses more than 9,300 gallons a year to leaks, according to EPA's WaterSense leak page.

For repairs, a contractor needs a C-36 plumbing license, which you can check with the Contractors State License Board. The pipes folder covers galvanized lines, repiping, slab leaks and pressure regulators.

What does California require for water heaters?

California requires that every new, replacement and existing residential water heater up to 120 gallons be braced, anchored or strapped against earthquake motion, under Health and Safety Code § 19211. A seller must certify that in writing. The 2025 Plumbing Code puts the straps in the upper third and lower third of the tank, with the lower one at least 4 inches above the controls.

Tank heaters typically last about 8 to 12 years, according to A. O. Smith and Rheem, and A. O. Smith suggests servicing twice a year on hard water. The Department of Energy suggests a setting of 120°F. LADWP lists heat pump water heater rebates of $1,500 to $2,500 for installs on or after November 1, 2025 (as listed in October 2026; check before buying), while the federal tax credit ended with 2025 installs. The water heater folder covers straps, flushing, tankless descaling and heat pumps.

What should every Valley home do before the next earthquake?

Four jobs cover most of it: strap the water heater, learn to close the main water valve, store water, and know the rules for your gas line. The January 17, 1994 Northridge earthquake, magnitude 6.7, shook the Valley hard for 10 to 20 seconds and left about 1,400 leaks in LADWP's system and gas outages for some 151,000 customers, according to USGS and NIST.

Ready.gov says to shut the house valve, not the street valve in the curb box, if pipes break. The CDC's baseline is 1 gallon per person per day for at least 3 days, and a strapped tank heater holds about 40 usable gallons, per FEMA. In Los Angeles, LAMC 94.1216 requires a seismic or excess-flow gas shutoff valve before a sale, for alterations valued over $10,000 and for gas meter work; it goes on the house piping, not the meter. If you shut the gas off at the meter, SoCalGas turns it back on.

No matching rule was found for Burbank or Glendale, so ask their building departments. The quake folder walks through each step and what to check after the shaking stops.

When do filters or softeners make sense here?

When they solve a problem you have measured. A softener is a comfort and scale choice on LADWP's moderately hard water and a stronger case on Burbank, Glendale or San Fernando water. A drinking-water filter earns its place when it is certified for the exact contaminant you want to reduce, such as lead.

Salt softeners face no rule in the San Fernando Valley that this site could find, but the Los Angeles County Sanitation Districts ban automatic salt softeners throughout the Santa Clarita Valley, where installation has been barred since 2003; check with your city before installing one. The filters folder compares softeners, salt-free conditioners, carbon filters and reverse osmosis, and how to test your water first.