Find your Tustin before you call anyone
Three houses a mile apart can sit under two permit authorities and two water utilities. Here is how 92780, 92782 and 92705 differ, and what tends to fail first in each.
Find your Tustin before you call anyone
Three houses a mile apart can sit under two different permit authorities and two different water utilities. Getting this wrong is the most common administrative mistake made on plumbing work in this area, and it is the one that stalls a job at inspection.
92780 · City of Tustin
Old Town, the Red Hill corridor, Broadmoor and central Tustin. Columbus Tustin laid the original grid out in 1868, and buildings from the 1880s still stand along Main Street and El Camino Real. Ringing that core are the post war tracts put up between roughly 1950 and 1975.
- PermitsCity of Tustin Building Division, filed through the Citizen Self Service portal
- Permit counter714-573-3130
- WaterTustin Water Services, or Irvine Ranch Water District depending on the street
- Fails firstGalvanised supply, cast iron drains, clay laterals taking roots, slab leaks in the post war tracts
92782 · City of Tustin
Tustin Ranch and Tustin Legacy. The newest housing in the city, much of it standing on the old Marine Corps Air Station land. The base closed in July 1999. Hangar No. 1 burned on 7 November 2023 and Hangar No. 2 still stands over the neighbourhood.
- PermitsCity of Tustin Building Division, Citizen Self Service portal
- WaterTustin Water Services or Irvine Ranch Water District, street by street
- Fails firstScaled recirculating loops, first generation copper, builder grade angle stops, tankless units past their descaling interval
- Worth checkingNewer Tustin Legacy homes may still sit inside a builder warranty window
92705 · County of Orange, not the City
North Tustin, Cowan Heights, Lemon Heights and Panorama Heights are unincorporated. The mailing address says Santa Ana, the community says Tustin, and the permit goes to neither city.
- PermitsCounty of Orange. Filing with the City of Tustin here is the single most common error on local plumbing work
- LotsLarge parcels with long private sewer laterals the owner maintains
- Fails firstLateral root intrusion over long runs, pressure regulation problems across hillside elevation change, septic in a few pockets
Neighbourhood guides
Each area fails differently. These go deeper on the housing stock, the pipe materials and the permit authority for your specific part of Tustin.
Old Town Tustin
92780. Built 1880s to 1930s. Galvanised supply, cast iron drains, clay laterals under a mature street canopy.
Repipes without wrecking plasterTustin Ranch
92782. Late 1980s to 1990s. First generation copper and recirculating hot water loops scaling closed.
HOA rules on shutoff accessTustin Legacy
92782. 2010s onward on the former air station land. PEX manifolds, builder grade valves, tankless past descaling.
Check the warranty window firstNorth Tustin
92705. Unincorporated county. Long private laterals, hillside pressure variation, septic in a few pockets.
County permits, not CityWater where it should not be?
Call now. A person picks up, day or night, and you will get a straight answer about what it probably is before you spend a dollar. Serving 92780, 92782 and North Tustin 92705.
Referral service disclosure. Tustin CA Plumber is a local plumbing referral and information service. We are not a licensed plumbing contractor and we do not perform plumbing work ourselves. Nothing on this site is an offer to perform work or a quotation. All plumbing work is carried out by independent contractors licensed by the California Contractors State License Board in classification C-36, operating under their own licence, bond and insurance. Your assigned contractor is responsible for providing their CSLB licence number on your written estimate and invoice, and you should verify it at cslb.ca.gov before work begins. California contractors are required to display their licence number in advertising under Business and Professions Code section 7030.5.
Code, permit and utility information on this page was last reviewed September 2026. It is general guidance, not legal advice, and not a substitute for confirming requirements for your specific property with the City of Tustin Building Division, the County of Orange, or your water provider. Prices shown are typical ranges for this area, not quotes. Every job is priced in writing after inspection.
Serving readers in Tustin, CA 92780 and 92782, and unincorporated North Tustin 92705, including Old Town Tustin, Tustin Ranch, Tustin Legacy, the Red Hill corridor, Broadmoor, Cowan Heights, Lemon Heights and Panorama Heights.