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California Commercial Plumbing Compliance Calendar.

Every plumbing-related compliance obligation that applies to a California commercial property — organized by month, with the trigger, the governing agency, and the consequence of missing it.

Put It on a Program (714) 632-0170
Backflow testing is due on a rolling 12-month cycle — most agencies don't send reminders
Grease trap service is required before the 25% capacity threshold — regardless of schedule
Health permit renewals in California are frequently conditioned on current backflow certification
Failed backflow assemblies must be repaired and retested within 30–60 days (agency-dependent)
A sewage overflow must be reported to your sewer agency within 24 hours — this is a legal requirement

COMPLIANCE REFERENCE — 2026

Switch between the calendar overview and the detailed list reference. Both cover the same obligations.

Legend: Backflow FOG / Grease Permits Water System Audit / General
January Q1
Audit Pull every compliance certificate. Log expiration dates for the full year ahead.
Backflow Schedule annual test if not on a managed program. Don't wait for a reminder — most agencies don't send one.
FOG Q1 grease trap service. First service of the calendar year for food service operators.
February Q1
Permits Business license renewals are due in many CA cities this month. Check your municipality.
Backflow Confirm your current certification is on file with your water agency — not just in your records.
Audit Review any 30–60 day repair windows from failed tests in the prior year. Are all retests complete?
March Q1
Water System Pre-season cooling tower inspection. Start your Legionella water management plan before summer water temps rise.
FOG Spring grease trap service before pre-summer volume increase begins.
Audit Confirm all Q1 service records are documented and filed with the appropriate agencies.
April Q2
Permits Health Department annual permit renewals due for many CA food service operators. Backflow certification is frequently a condition of renewal.
Backflow IRWD annual program notices typically go out in spring. Schedule testing before the notice becomes a deadline.
May Q2
FOG Pre-summer grease trap service. Summer means higher kitchen throughput — service now, before the volume hits.
Backflow Irrigation startup: confirm backflow assembly test is current on all irrigation connections before season activation.
Audit Mid-Q2 check: where does annual testing stand across all properties in your portfolio?
June Q2
Water System Cooling tower biocide treatment and monitoring program active. Confirm Legionella control is in place for summer.
FOG Q2 close — grease trap service for operations on quarterly programs.
Backflow Any assembly that failed in Q1 must be repaired and retested now. The 60-day window closes this month for most Q1 failures.
July Q3
Audit Mid-year compliance audit. Pull all property compliance records and identify any gaps before Q4 deadlines pile up.
FOG Q3 grease trap service for quarterly programs. Peak summer volume — trap levels should be monitored closely.
August Q3
Backflow OCSD and many OC water agencies send annual testing reminders in late summer. Schedule early — certified testers fill up fast in September.
Permits Some local health permit cycles run August/September. Check your city or county health department.
Audit Any assemblies on 30–60 day repair windows from Q2 failures must be retested before this month closes.
September Q3
FOG Pre-holiday grease trap service. Holiday volume begins in October — service now, not after the first backup.
Backflow Final window for properties on December renewal cycles. Don't let Q4 busyness push this into a missed deadline.
Audit Q3 close: confirm all annual testing requirements are met before the Q4 compliance crunch.
October Q4
FOG Holiday season starts. Grease trap must be serviced and documented before November — the highest-volume month of the year for food service.
Audit Year-end countdown: 90 days remain on most annual clocks. Review all compliance certificates now.
Permits Some CA city business license renewals begin processing in October for year-end cycles.
November High Priority
FOG — Critical Thanksgiving week is the peak FOG event of the year. Any grease trap not serviced before this week is a failure risk. No exceptions for food service operators.
Backflow Final window for any property that has not completed annual testing. Act now — not December.
Audit Confirm all compliance documentation is current for year-end insurance policy review.
December Q4
Audit End-of-year compliance audit. File all outstanding documents before the calendar year closes.
FOG Confirm all grease trap service records are complete and documented for the full year.
Backflow Last chance — contact your water agency immediately if testing was missed. Extensions are rarely granted but must be requested.
Plan Ahead Schedule Q1 services now. Service providers fill up fast in January.
Always On — Not Month-Specific These obligations are triggered by events, not dates

Trigger: Failed Test

Failed Backflow Assembly

Repair and retest within 30–60 days of the failed test — deadline is agency-dependent. Do not wait for a second notice.

Trigger: 25% Capacity

Grease Trap at Capacity

Service immediately when the trap reaches 25% of total volume. Do not wait for the next scheduled service date.

Trigger: Within 24 Hours

Sewage Overflow

A sewage overflow of any volume must be reported to your local sewer agency within 24 hours. This is a legal requirement in California.

Trigger: New Connection

New Plumbing Tie-In

Any new connection to the potable water supply requires a backflow prevention assembly before the connection is commissioned.

WHAT HAPPENS WHEN YOU MISS A DEADLINE

Noncompliance Doesn't Stay Quiet. It Escalates.

Each compliance program — backflow, FOG, health permits — runs its own enforcement cycle. Missing a deadline doesn't start a conversation. It starts a notice cycle that becomes progressively harder to reverse.

Commercial fire riser system with backflow prevention assembly
A fire riser assembly — one of several systems requiring annual compliance testing on the California commercial calendar

Stage 01

Written Notice of Noncompliance

Sent directly to the property owner of record — not the tenant, not the contractor. Creates a documented compliance gap that surfaces in due diligence, tenant audits, and insurance renewals. The notice is on file with the agency whether or not you respond.

Stage 02

Permit Hold or Health Department Action

Backflow noncompliance can hold up certificate of occupancy renewals and health permits. FOG noncompliance can trigger a health inspector visit and permit suspension. Business licenses in some CA cities are conditioned on current compliance records. Gaps appear exactly when you don't want them to — at renewal time.

Stage 03

Water Shutoff or Forced Closure

Persistent backflow noncompliance can result in water service interruption. Reinstatement requires full compliance documentation before reconnection. For food service operators, sustained FOG noncompliance can result in forced kitchen closure pending a compliance inspection. Neither outcome is reversible quickly.

AGENCY QUICK REFERENCE — SOUTHERN CALIFORNIA

Who Governs What, and Where.

Compliance obligations are enforced by the agency that serves your property's specific address — not a regional body. Filing with the wrong agency does not satisfy your obligation. Filing must go to the agency that holds your account.

IRWD

Irvine Ranch Water District

Serves Irvine, Tustin, portions of Orange and Santa Ana Canyon. Runs its own cross-connection control program with independent deadlines and filing requirements.

Governs: Backflow Testing

MWDOC

Municipal Water District of Orange County

Wholesale agency serving multiple Orange County retail water districts. Backflow requirements flow through each member district — check your retail provider.

Governs: Backflow (via member agencies)

LADWP

Los Angeles Dept. of Water and Power

Primary water purveyor for the City of Los Angeles. Cross-connection control program and backflow testing requirements are administered directly by LADWP.

Governs: Backflow Testing

OCSD

Orange County Sanitation District

Sewer agency serving most of Orange County. Administers FOG pretreatment ordinance for commercial food service. Grease trap service records must be available on demand.

Governs: FOG / Grease Compliance

LASAN

LA Sanitation and Environment

Sewer and wastewater authority for the City of Los Angeles. Enforces FOG pretreatment ordinance for LA city food service operators.

Governs: FOG / Grease Compliance

RCWD / EVMWD

Rancho California & Elsinore Valley MWD

Serving western Riverside County — Temecula, Murrieta, Lake Elsinore. Each runs its own backflow control program. Properties in these areas must file independently.

Governs: Backflow Testing

TAKE THE CALENDAR OFF YOUR PLATE

Put Everything on a Managed Program. We Track the Deadlines.

California Coast Plumbers manages backflow testing schedules, same-day agency filing, grease trap programs, and sewer camera inspection across commercial portfolios across Orange County, Los Angeles County, and Riverside County. One point of contact. Every deadline tracked. All documentation on file. C-36 Licensed — Lic. #736992.

See the Maintenance Program (714) 632-0170
Deadline Tracking

We maintain the compliance calendar for every property on your program — backflow, FOG, and inspection schedules all tracked proactively.

Same-Day Agency Filing

Backflow test results filed with IRWD, MWDOC, LADWP, RCWD, or WMWD the same day as the test — not queued, not batched.

FOG Documentation

Every grease trap service visit produces a manifest and a service record. Available on demand for health inspector or sewer agency review.

Portfolio-Scale

We coordinate across multiple properties and multiple agencies. One call, one program, one point of accountability.