National City gets its water from Sweetwater Authority, and the City of National City runs the sewer system and the permit desk. Plumber San Diego is a free referral service, not a plumbing company. Call the number on this page to be connected with a local plumber in National City.

Plumbing services in National City
San Diego's closest South Bay neighbor
National City sits just 4 miles from downtown San Diego in a straight line, between Interstate 5 and Interstate 805 with State Route 54 along its southern edge. Incorporated in 1887, it is the second-oldest city in San Diego County, and it had 56,173 residents at the 2020 Census. Its history runs through the Santa Fe Railway and the Navy, and its bayfront is part of Naval Base San Diego. National City Boulevard, Plaza Boulevard, the Mile of Cars and Westfield Plaza Bonita anchor the city, and Lincoln Acres is an unincorporated county pocket inside it.
Old houses, old pipes
Victorian-era homes still stand in National City, and plenty of other houses are decades old. In homes like these a plumber may find galvanized supply lines, cast iron drains, older gas piping and laterals that have been patched more than once. Repiping, drain and lateral repairs and water heater replacements in tight spaces are common jobs.
Water from Sweetwater Authority
Sweetwater Authority serves National City, Bonita and the western and central parts of Chula Vista. Its supply includes Sweetwater River water held in Sweetwater Reservoir, deep freshwater wells in National City, brackish wells in Chula Vista that are desalinated, and imported Colorado River or State Water Project water. Chloramines are the system disinfectant. Sweetwater's number is (619) 420-1413.
Sweetwater runs its own cross-connection program: backflow devices must be tested when installed and every year after by a tester the Authority has certified and approved, with costs on the customer.
City sewer
The City of National City provides sewer service to about 9,000 customers through roughly 105 miles of main and two pump stations. Sewer charges are a flat monthly rate collected on the property tax bill, not the water bill. If a main line is blocked, call Engineering and Public Works at (619) 336-4580 on weekdays or National City Police at (619) 336-4411 after hours. A blockage inside the house or in your private lateral calls for a plumber.
Permits and gas
The Planning and Building Department's Building Division (619-336-4210) requires plumbing permits for new work, repairs, alterations and fixture replacement where the trap is broken, and water heater replacement needs a permit too. SDG&E supplies gas. If you smell gas, leave the building first, then call 911 and SDG&E at 1-800-611-7343 from a safe place.
How it compares with San Diego
Although the cities touch, National City uses a different water agency, its own sewer crews and its own permit rules. When you call, tell us your cross street and what you are seeing, and you will be connected with an independent plumber who sets the price and timing with you.
Common questions in National City
Who provides water in National City?
Why isn't sewer on my National City water bill?
Does replacing a toilet need a permit in National City?
Who do I call about a blocked sewer main in National City?
Nearby cities and towns
Sources
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