Safety problems nobody checked
Water heater vents that spill exhaust, relief lines that are capped or run uphill, missing straps, and gas connections nobody pressure tested. These are the items the City's standard exists to catch.
Homeowner guide
Costa Mesa plumbing permits, explained
Plumbing permits in Costa Mesa come from the City's Building Safety Division at 77 Fair Drive and run through the online TESSA system. Sewer lateral work also needs a permit from the Costa Mesa Sanitary District. Here is how both work and what inspectors check.
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Written and fact-checked by John, editor, MBA in marketing
Updated against City, utility and state sources
Quick answer
In Costa Mesa, plumbing permits are issued by the City's Building Safety Division, 77 Fair Drive, 2nd floor, 714-754-5273, through the TESSA online system. Simple limited-scope jobs may qualify for an Insta-Permit. Water heaters must meet the City's installation standard. Work that builds, changes or reuses a sewer lateral also needs a Costa Mesa Sanitary District sewer permit.
- Building Safety
- 77 Fair Drive, 2nd floor
- Phone
- 714-754-5273
- Online system
- TESSA
- Sewer permits
- Costa Mesa Sanitary District
Where to get a plumbing permit in Costa Mesa
Plumbing permits in Costa Mesa are issued by the City of Costa Mesa Building Safety Division, which is at 77 Fair Drive on the 2nd floor and takes applications through its online system, TESSA.
Building Safety is part of the City's Economic and Development Services department. It reviews plans, issues building, plumbing, mechanical and electrical permits, and sends inspectors out to check the work. For a homeowner, the important part is simple: if your plumbing job needs a permit, it comes from this office, and your contractor will usually pull it for you.
- Office
- City of Costa Mesa Building Safety Division, 77 Fair Drive, 2nd Floor, Costa Mesa, CA 92626
- Main building line
- 714-754-5273
- buildingpermit@costamesaca.gov
- Applications and plans
- TESSA, the City's online permit system
- Simple jobs
- Insta-Permits for certain simple projects with a limited scope
- Help with TESSA
- Make an appointment with a building technician
- Sewer lateral permits
- Costa Mesa Sanitary District, 290 Paularino Ave, (949) 645-8400
How TESSA and Insta-Permits work
TESSA is Costa Mesa's online system for submitting plans, getting permits and booking inspections, and Insta-Permits are a faster path inside it for certain simple, limited-scope projects.
The Building Safety page tells applicants to use TESSA to submit plans and obtain permits. If you get stuck, the City offers appointments with a building technician who will walk you through it. Inspections are booked in TESSA too, and the City's water heater standard says supporting documents should be uploaded there before the inspector arrives.
For small jobs, the City offers Insta-Permits. The Building Safety page describes them as being "for certain simple projects with a limited scope of work" and points to a separate Insta-Permit page for the current list. That list can change, so we do not reproduce it here. If you are replacing a water heater or doing another routine swap, check the Insta-Permit page or ask your plumber whether it qualifies.
Confirm the scope
Decide exactly what is being replaced, added or moved. The work type you select on the application has to match what is done.
Apply in TESSA
The licensed contractor usually applies, listing the state license number, class and workers' compensation policy, which the City's application asks for.
Pay and receive the permit
Fees depend on the work types and are set by the City. We do not quote them here because they change; TESSA shows the current amount.
Do the work within construction hours
Monday to Friday 7 a.m. to 7 p.m., Saturday 9 a.m. to 6 p.m., and none on Sundays or the City's listed federal holidays.
Book the inspection
Schedule it in TESSA and upload any requested documents first. Make sure the inspector can reach the work.
Keep the final
Save the finaled permit with your home records. It matters at sale and with insurance questions.
Plumbing work types on the Costa Mesa permit application
The City of Costa Mesa plumbing permit application lists more than 45 work types, including water heater, water repipe, gas repipe, expansion tank, sewer connect and sewer private line.
The application form is a checklist. The contractor marks each item being installed or changed, and the City calculates the permit from those items. Seeing the list is the easiest way to understand what the City considers permitted plumbing work. We grouped the items below. If your job matches one of them, expect a permit.
| Group | Items on the application | Typical home job |
|---|---|---|
| Water heating | Water Heater, Expansion Tank, Pressure Regulator | Tank or tankless replacement, adding an expansion tank |
| Water piping | Water Repipe, Water Piping Inst/Re, Water Service, Water Softener | Whole-house repipe, slab leak reroute, new main line, softener loop |
| Gas | Gas Repipe, Gas Service, Gas Outlet (1 to 4), Gas Outlet 5+, Gas Earthquake Valve | New range or dryer line, BBQ line, seismic gas shutoff |
| Sewer and drains | Sewer Connect, Sewer Private Line, Sewer Cap / Demo, Waste and Vent, Drain Floor, Drain Roof, Drain Rainwater, P-Trap | Sewer lateral replacement, new drain lines in a remodel |
| Fixtures | Water Closet, Bath Tub, Shower, Wash Basin, Sink Kitchen, Sink Bar, Laundry Tub/Washer, Dishwasher, Urinal, Drinking Fountain | Bathroom or kitchen remodel, relocated fixtures |
| Backflow and irrigation | BackFlow Preventer, BackFlow Irrigation, Vacuum Breaker, and a separate item for yard irrigation systems | New irrigation system, backflow device |
| Pools and outdoor | Swim Pool, SPA | Pool or spa plumbing |
| Commercial | Interceptors (Grease and Sand), Clarifier System, Sink Commercial, Sink Floor, Sink Service Mop, Receptors, Trap Primer, Process Piping, Dental Units, Connect Coffee and Ice | Restaurants, shops and offices |
| Other | Septic Tank, Sump Pump, Other | Less common work |
The application also asks whether the property is in a homeowner association and notes that an HOA approval letter is required when it is. Many Costa Mesa condos and townhomes fall under an HOA, so get that letter early. It also warns that a reinspection fee may be charged for each inspection or reinspection, which is one more reason to have the work ready the first time the inspector comes.
What about small repairs like clearing a clog, swapping a faucet cartridge or fixing a running toilet? We could not find a Costa Mesa handout listing exempt plumbing work, so we will not tell you a job is exempt. If you are unsure, ask Building Safety. For the repairs themselves, see our toilet and faucet repair and drain cleaning pages.
Restaurants and shops along 17th Street, Harbor Blvd and in South Coast Metro will see the commercial items most often, especially grease interceptors. Our commercial plumbing page covers that work.
The City of Costa Mesa water heater installation standard
Costa Mesa publishes its own water heater installation standard, released 09-2024, and inspectors check new and replacement water heaters against it.
The standard is a single document that pulls the California Plumbing Code rules for water heaters into one checklist, plus a few local rules. It has roughly 89 numbered requirements and diagrams. We summarize the ones that matter most in a typical Costa Mesa garage install below. Your installer should work from the full document. If you are planning a replacement, our water heater repair and replacement page and our tankless water heater page cover the job itself.
| Topic | What the standard requires |
|---|---|
| Seismic straps | Strapping at the upper and lower third of the heater's height (CPC 507.2), with straps 4 inches above the control panel |
| Relief valve | A pressure relief device at the water heater (CPC 504.4); no shutoff or check valve before or after the temperature and pressure relief valve (CPC 504.6) |
| Relief drain line | At least 3/4 inch and not smaller than the valve outlet; drains by gravity, never uphill or trapped; no threads on the end; end pointing down, 6 to 24 inches above the ground; not into the drain pan; each relief valve piped on its own |
| Plastic tubing | No PEX, PEX-AL-PEX, PE-AL-PE or PE-RT tubing within the first 18 inches of the heater |
| Location | Not in bedrooms or bathrooms (CPC 504.1); not where flammables are stored; fuel-fired heaters not in storage closets (local rule); the heater must not be visible to the public |
| Garages | A barrier or raised platform where the heater is in a vehicle path; ignition source at least 18 inches above the garage floor, with exceptions for certain units |
| Support | A concrete pad at least 3 inches thick if the heater sits on the ground (CPC 507.4) |
| Combustion air | Indoor air alone only if infiltration is at least 0.40 air changes per hour; rules for exterior openings, including at least 12 inches above grade |
| Venting | All flue gases carried outdoors; gas vents above the roof except direct vent units; Type B or L vents at least 5 feet vertical above the draft hood or flue collar; no venting through ducts or plenums |
| Expansion tank | Required where a pressure regulator or backflow device prevents pressure from relieving back to the main |
| Water pressure | At least 15 psi after all pressure losses (CPC 608.1) |
| Inspections | A preliminary Public Works inspection before work begins and a final Public Works inspection right before the final building inspection; documents uploaded in TESSA |
Why these rules matter in Costa Mesa homes
About 73% of Costa Mesa's housing was built before 1980, according to the City's 2021 Housing Element, and most of it went up in the 1950s, 1960s and 1970s. Many homes of that era have the water heater in the garage, sometimes in a closet that opens to the outside. An old install often fails today's standard in small ways: one strap instead of two, a relief line running uphill or into a pan, plastic tubing right off the top of the tank, or no barrier in front of the heater where the car parks. A replacement is the moment those get corrected.
The "not visible to the public" rule catches some people. A heater on an exterior wall facing the street may need an enclosure.
State law on strapping
California Health and Safety Code section 19211 requires all new, replacement and existing residential water heaters to be braced, anchored or strapped against earthquake motion, at least to the Plumbing Code standard. It also requires the seller of any property with a water heater to certify that in writing to the buyer.
Published cost ranges
Angi's published estimate for a tank water heater replacement is $600 to $2,500 installed (2025). It is a national range, not a quote, and permit fees and code corrections can move a job within it. Call (657) 669-4766 for an exact written quote for your home.
Construction hours for plumbing work in Costa Mesa
Permitted construction work in Costa Mesa is allowed Monday to Friday from 7 a.m. to 7 p.m. and Saturday from 9 a.m. to 6 p.m., with no work on Sundays or the City's specified federal holidays.
| Day | Allowed hours |
|---|---|
| Monday to Friday | 7 a.m. to 7 p.m. |
| Saturday | 9 a.m. to 6 p.m. |
| Sunday | Not allowed |
| Specified federal holidays | Not allowed |
The City's document notes that violators may be cited and fined. These limits are about planned construction. Emergency repairs are a different situation: if a pipe bursts on a Sunday night, a plumber can stop the water and make the home safe. The permitted replacement work, such as a new water heater install or a repipe, is then scheduled inside normal hours. We answer the phone 24/7 and will tell you what can be done right away and what has to wait for a weekday. Our emergency plumber page explains how that works.
If you live in a condo or apartment, your HOA or building may have stricter quiet hours. Check before booking Saturday work.
Costa Mesa Sanitary District sewer permits
Any project that builds, reconfigures or reuses a sewer lateral in Costa Mesa needs Costa Mesa Sanitary District plan approval and a sewer permit, separate from the City's plumbing permit.
The Costa Mesa Sanitary District, founded in 1944, runs the public sewer for about 118,000 residents and sends the flow to OC San for treatment. Its sewer permit guide sets out the rules for laterals, the pipes that carry wastewater from a building to the public main.
- Plan approval first. The guide says sewer plan approval and fee payment are required before construction. Plans are submitted during the plan review process for projects that build or reconfigure a lateral.
- Show existing laterals. Plans must show existing laterals. The guide notes that existing laterals in the street or alley right-of-way are 6-inch vitrified clay pipe.
- The camera rule. If a lateral is being reused, the plan must carry this note: the contractor will CCTV the existing lateral and provide the video to CMSD, and deficiencies, if any, will be repaired.
- Plumbing Code. Plans must state that on-site sewer will be built to the 2019 California Plumbing Code, as written in the guide.
- Online portal. Applications, fees and inspection scheduling go through CMSD's Cityworks public portal, reached from the Permits section of cmsdca.gov.
- Industrial waste. Non-domestic discharges need an OC San Industrial Wastewater Discharge Permit, which must be shown to CMSD.
CMSD's office is at 290 Paularino Ave, phone (949) 645-8400, email permits@cmsdca.gov. Office hours are Monday to Thursday, 7:30 a.m. to 4:30 p.m., and every other Friday, 7:30 a.m. to 3:30 p.m.
A sewer lateral replacement usually involves both agencies: the City's plumbing permit lists "Sewer Connect" and "Sewer Private Line" as work types, and CMSD handles the sewer permit and its own inspection. Our sewer lateral guide explains the camera rule in more depth, and our sewer line camera and repair page covers repair options.
The risks of unpermitted plumbing work
Unpermitted plumbing work can fail inspection later, surface during a home sale, and leave hidden safety problems in gas, venting and water heater installs.
A permit is not just paperwork. The inspection is a second set of eyes on work that ends up behind walls, under slabs and in garages. Skipping it shifts every risk to the owner. Here is what we see go wrong in Costa Mesa homes.
Problems at sale
Buyers' inspectors look for permit history. State law already requires sellers to certify water heater strapping in writing, and unpermitted work can lead to repair requests, credits or delays.
Rework at the next permit
When you pull a permit for a later project, the inspector may see earlier work that does not meet code. Correcting it then often means opening finished walls.
Fixture rules on alterations
California Civil Code section 1101.4 makes replacing noncompliant plumbing fixtures a condition of final permit approval for alterations on covered single-family homes. Ask the inspector whether it applies to yours.
How to protect yourself
- Ask whether the job needs a permit before it starts, and who will pull it
- Hire a licensed contractor and check the license; our license check guide shows how
- Get a written price that says whether permit fees are included
- Make sure the inspection is booked and passed before the final payment
- Keep the finaled permit with your home records
If you own a home with work you suspect was never permitted, call Building Safety at 714-754-5273 and ask how the City handles it. Every city has its own process, and we would rather you hear it from the City than from us.
For bigger projects such as a whole-house repipe or a new gas line, the permit is a normal part of the job, and we pull it when the work requires one. You get a written price before work starts, and the work is done by independent CSLB-licensed C-36 plumbing contractors.
Water where it shouldn't be? Call now.
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Questions Costa Mesa homeowners ask
Do I need a permit to replace a water heater in Costa Mesa?
Yes. Water Heater is a work type on the City's plumbing permit application, and the install must meet the City of Costa Mesa water heater installation standard. Some simple jobs may qualify for an Insta-Permit in TESSA.
Where do I get a plumbing permit in Costa Mesa?
From the City of Costa Mesa Building Safety Division at 77 Fair Drive, 2nd floor, 714-754-5273. Applications and inspections go through the City's online system, TESSA.
What is TESSA in Costa Mesa?
TESSA is the City of Costa Mesa's online permit system. It is used to submit plans, get permits and book inspections. The City offers appointments with a building technician if you need help using it.
What are the construction hours in Costa Mesa?
Monday to Friday 7 a.m. to 7 p.m. and Saturday 9 a.m. to 6 p.m. No construction work is allowed on Sundays or the City's specified federal holidays.
Do I need a Sanitary District permit to replace my sewer line?
Yes, if the project builds, reconfigures or reuses a sewer lateral. The Costa Mesa Sanitary District requires plan approval and a sewer permit through its online portal, and a reused lateral must be camera inspected with the video sent to CMSD.
Where can a water heater go in a Costa Mesa home?
Not in a bedroom or bathroom, not where flammables are stored, and a fuel-fired heater not in a storage closet. It must not be visible to the public, and in a garage it needs a barrier or platform if it is in a vehicle path.
Can I use PEX to connect my water heater?
Not within the first 18 inches of the heater. The City's standard prohibits PEX, PEX-AL-PEX, PE-AL-PE and PE-RT tubing in that section, so the first 18 inches is typically metal.
Who pulls the plumbing permit, me or the plumber?
Usually the licensed contractor. The City's application asks for the contractor's state license number, class and workers' compensation policy. Ask before work starts who will pull it and whether the fee is in the price.
Sources
Facts on this page come from these public sources, checked November 1, 2026.
- City of Costa Mesa Building Safety
- City of Costa Mesa plumbing permit application
- City of Costa Mesa water heater installation standard (09-2024)
- Costa Mesa Sanitary District sewer permit guide
- ISDOC: Costa Mesa Sanitary District
- City of Costa Mesa Housing Element, April 2021
- California Health and Safety Code section 19211
- California Civil Code section 1101.4
- Southern California Edison: always call 811 before digging
- Angi: water heater installation cost
- CSLB: Check a License