Water heater repair in Napa, CA

Lake Hennessey, Milliken and the State Water Project

The City of Napa has owned its water system for about a century and relies on three surface water sources. Lake Hennessey, formed by Conn Dam in the hills roughly 13 miles north of town, is the largest local supply. Its water goes to the Hennessey Water Treatment Plant, which has run since the early 1980s. Milliken Reservoir in the hills northeast of the city feeds the smaller Milliken plant.

The third source is State Water Project water drawn from the Delta and delivered through the North Bay Aqueduct. All of it is treated at the Edward I. Barwick Jamieson Canyon Water Treatment Plant, south of the city near the Jamieson Canyon road toward Fairfield. How much state water arrives each year depends on hydrology, so in a dry year the city leans more on its own reservoirs.

Because Napa uses surface water rather than wells, hardness stays low compared with Southern California and the Central Valley. That is good news for scale, but softer water can wear out anode rods faster. Delta water from the aqueduct can also carry more dissolved organics and occasionally a different taste, and the blend shifts with the season.

The 2014 South Napa earthquake and what it taught

Before dawn on August 24, 2014, a magnitude 6.0 earthquake on the West Napa fault shook the city. Chimneys fell across the older neighborhoods, brick facades crumbled downtown, and water mains broke in many places. Gas leaks and fires followed, including in mobile home parks where homes shifted off their supports.

Water heaters were part of that story. Unstrapped and poorly strapped tanks tipped, tore loose from rigid gas and water connections, and flooded garages and closets. Plumbers in Napa still find heaters held by a single strap or by plumber's tape screwed into drywall. Code calls for a strap in the top third and another in the bottom third, both lagged into framing, plus a flexible gas line, which many 2014 casualties lacked.

If you live in Old Town, Alta Heights or the Browns Valley area and your heater has not been looked at since the quake, it is worth having the straps and connectors checked. In Victorian-era houses with gas piping snaking through a crawlspace, an automatic shutoff at the meter is cheap insurance.

Victorians, ranch homes and newer tracts

Napa's historic districts, including Napa Abajo, Fuller Park and the streets near downtown, are full of Victorians, Queen Annes and Craftsman bungalows. Heaters there may be in a basement, a back porch, a converted pantry or a small detached garage. Venting often runs up through tight spaces, and some still use old masonry chimneys that need a liner.

Postwar ranch homes fill Westwood, the Linda Vista area and the neighborhoods off Trancas Street and Browns Valley Road. Those houses mostly run a 40-gallon gas tank out in the garage, though some Westwood homes tuck it into an indoor laundry closet. Newer subdivisions in north Napa and along the outskirts have 50-gallon tanks, tankless units and occasionally heat pump water heaters.

Homes near the Napa River can face flooding during big winter storms, as in 1986 and the 2005 New Year's flood. The flood control project has reduced the risk, but a heater in a low garage near the river should sit on a stand, and any heater that has been underwater must be replaced.

Fire weather, smoke and power shutoffs

Wildfires in the hills around Napa, including the 2017 Atlas fire and the 2020 Glass fire, brought smoke and ash into town and evacuations along the eastern and northern edges. During fall wind events PG&E has de-energized lines across parts of Napa County, with hillside neighborhoods most often affected. When that happens, any heater with a blower, control board or compressor goes cold until service returns.

Winter is cool and damp. Inlet water in December and January can run near 50°F, so large families in older homes with 40-gallon tanks often notice shorter showers. Morning fog and frost make garages chilly, which slightly slows heat pump water heaters.

The problems plumbers see most in Napa

• Weak or missing earthquake straps on heaters that survived 2014 untouched.
• Rigid gas or water connections that could break in the next quake.
• Anodes worn away quickly on soft surface water, leading to early tank corrosion.
• Masonry chimney venting problems in Victorians and bungalows.
• Short hot water in winter from cold inlet water and small tanks.
• Power-dependent heaters going cold during PG&E shutoffs in hillside areas.

Typical water heater prices in Napa

Napa prices reflect North Bay labor costs, higher than the Central Valley but a bit below San Francisco. Jobs in Fuller Park Victorians that need a chimney liner, or in Browns Valley homes with a long gas run to the garage, drift toward the top of these ranges.

Permits and licensing in Napa

Inside city limits, Napa's Building Division within Community Development issues the permit for a heater replacement. The inspector looks at strapping, venting, gas shutoff and connector, relief line routing and an expansion tank if needed. Properties outside city limits, including Silverado and other unincorporated areas, are permitted through Napa County.

Ask any Napa installer for a CSLB license number and check that it carries the C-36 plumbing class. Napa County belongs to the Bay Area Air District, whose zero-NOx standard will stop the sale of most new gas storage water heaters here starting in 2027. Repairs to existing gas heaters remain allowed.

PG&E, MCE and heat pump options

PG&E delivers gas and electricity in Napa. Most city customers buy their electric generation from MCE, the community choice provider that serves Napa County, unless they opt out. MCE has run its own heat pump water heater incentives at times, and PG&E and statewide programs have stacked on top in some years.

Heat pump tanks are a good fit for many Napa garages, especially with the 2027 air district rule approaching. Plan for a dedicated 240-volt line, about seven feet of height and a place to drain condensate; a 1950s Westwood panel may need upgrading first.

Repair or replace in Napa

A Napa heater under eight years old with a worn igniter, valve or element is a repair job, not a replacement. On soft Napa water, rust-colored hot water or a smell from the tank can point to a spent anode, and replacing it can extend the tank's life if the steel is still sound; see our notes on soft-water tank life for what to expect. A leak from the base, an older tank that was never strapped, or one damaged by the 2014 quake usually means replacement.

Around Napa

American Canyon, down Highway 29 near the Solano line, has a city-run water utility and its own permit desk. Yountville and St. Helena up the valley each have their own water and permit offices. Vallejo, across the county line in Solano County, has a separate municipal water system and building division.

Water heater questions from Napa