Water Submetering in California Rentals: How Your Water Bill Is Calculated, and Who Pays for a Leak
Most California renters learn how their building bills for water on the month it goes wrong: a charge that used to be $22 arrives at $180, with no explanation. Before you can argue about that number, you need to know which of three systems produced it — the rules, and your leverage, differ sharply in each.
The three ways water gets billed in a California rental
- Master-metered, water included in rent. One meter, the agency bills the owner, the cost is baked into rent. You never see a water bill — still the default in much of California's older multifamily housing.
- Submetered. The building keeps its master meter, but the owner has installed an individual meter on each unit's supply line and bills measured consumption. Your charge reflects water that physically flowed through your pipes.
- RUBS — ratio utility billing. No individual meters exist. The owner divides the master bill by formula: square footage, occupants, bedrooms, or a blend. Nothing is measured; it is an allocation.
California wrote a detailed rulebook for one of these and not the other.
What the law requires when a landlord submeters
SB 7, signed in 2016 and operative January 1, 2018, added a chapter to the California Civil Code — sections 1954.201 through 1954.219 — governing how residential water submeters may be billed. Secondary write-ups routinely get one point wrong: it is not limited to new construction. Section 1954.216 applies to units in buildings where submeters were required by a building standard and to "all dwelling units where submeters are used to charge a tenant separately for water service." If you are submetered, you are covered, whatever the building's age.
Separately, Water Code section 537.1 requires newly built multiunit residential structures — those for which an application for a water connection was submitted after January 1, 2018 — to measure water supplied to each unit, by individual meters or submeters. Several categories are exempt, including low-income housing, student housing, long-term care facilities, and time-shares.
Where it applies, the chapter gives you concrete rights. Before you sign, a written disclosure in at least 10-point type must state that water is billed separately, estimate the monthly charge, give due dates, list the only charges that may appear, provide contact information including a toll-free number, and tell you to report leaks or abnormal usage — and that the landlord must then investigate and, if necessary, repair. Each bill must show the submeter readings at both ends of the period, the consumption, itemized charges, the volumetric rate, the total and due date, a statement that the landlord is not the water purveyor plus the purveyor's name, and a leak-reporting contact. On request, the landlord must tell you where your submeter is and how the charge was calculated.
One rule is easy to overlook: a submeter must measure only water supplied for the exclusive use of your unit, in an area under your exclusive possession and control. Common-area landscaping, a shared laundry room, or a pool auto-fill has no business on a compliant unit submeter.
What a landlord may add on top of the water itself
This is the part most tenants never check. Under Civil Code section 1954.205, a submetered water bill may contain only four things: your volumetric usage charge, a share of the fixed service charge the agency bills the property, an administrative fee capped at the lesser of $4.75 or 25% of the amount billed (inflation-adjusted annually since January 1, 2018), and late charges. That is the complete list — a "billing service fee," a "utility management fee," and a "processing charge" stacked on one statement are not separate categories you must accept. Late fees are capped too: section 1954.213 allows up to $7 if a bill is unpaid 25 days after it was sent, up to $10 on each subsequent bill, and no more than 10% of the unpaid amount in any 12-month period.
Why RUBS is the contentious one
None of the above protects a RUBS tenant, and the statute says so directly: the chapter neither favors nor disfavors ratio utility billing. A RUBS charge is not a measurement, so there is nothing to audit. If the irrigation controller sticks open, or a vacant unit's toilet runs for six weeks, that water lands in the master bill and is divided among everyone — including you. Your levers are the lease terms, the allocation formula, and your city's rent stabilization ordinance. A 2025 state bill that would have restricted RUBS did not become law, so there is no new statewide rule to point to; check locally, since several California cities regulate utility pass-throughs in rent-stabilized units.
When a submetered bill spikes: work it in this order
A spike means water genuinely moved through your meter — not that you used it.
- Read the submeter with everything off. Same technique as a house meter; our guide on reading a water meter to check for a hidden leak covers the shut-off test and the two-reading confirmation.
- Check the toilet first. A worn flapper is the most common silent consumer in an apartment and leaves no puddle; see what a running toilet costs to fix.
- Check anything irrigated that is billed to you. A cracked drip line on a private patio runs silently for months — see irrigation and sprinkler leak repair.
- Rule out the rest using our breakdown of what actually causes a high water bill, then report in writing.
The provision worth knowing by heart
If you report a leak or abnormal usage on a submetered unit, Civil Code section 1954.210 requires the landlord to have the condition investigated and, if warranted, fixed. If it is not fixed, your volumetric usage for any month covering the period beginning 21 days after that initial investigation is deemed to be $15 or your actual usage, whichever is less. If it is still unrepaired 180 days after investigation, no further volumetric charges may be imposed until it is fixed. In plain terms: you are not supposed to pay month after month for water lost to a defect you reported — and since the clock runs from the investigation, the date of your notice has to exist on paper.
The repair is a separate question from the billing, and under California's habitability rules it usually sits with the landlord — our guide on who pays for plumbing repairs in a California rental covers that duty, response times, and repair-and-deduct, and the renter and landlord responsibilities overview covers tenant-caused exceptions. In a rented condo a third party may own the pipe entirely; see how HOA and condo plumbing repairs are split.
What to put in the written notice
Email or a dated letter, kept as a copy. Include the date, the unit, what you observed, your submeter readings and when you took them, the amounts you dispute, a request that the condition be investigated and repaired, and a request for the submeter location and the calculation behind the charge. A verbal report is worth nothing when a statutory clock runs from a specific day.
A note for small landlords and property managers
Submetering works — that is the honest finding in the literature. The EPA-sponsored National Multiple Family Submetering and Allocation Billing Program Study by Peter Mayer, Erin Towler, William DeOreo and colleagues in 2004 measured roughly 15% lower water consumption in submetered multifamily properties than where water was included in rent (study on Google Scholar) — consistent with the 2003 Land Economics meta-analysis by Dalhuisen, Florax, de Groot and Nijkamp finding residential water demand responds to price, with rate structure explaining much of the variation between studies (meta-analysis on Google Scholar).
The catch is that a submeter is plumbing hardware with a service life: it needs periodic reinspection and recalibration, it eventually fails, and a leaking unit generates billed usage the tenant will dispute — under a statute that stops the meter after 21 days. Fixing a flapper is cheap; arguing about six months of volumetric charges is not. Treat toilet repair as routine maintenance, and bring in professional leak detection early when a spike has no visible cause.
Get the leak found before the next billing cycle
Whether you are the tenant staring at the bill or the owner who will pay the invoice, the fix is the same: locate the leak and document the date. Renters, landlords, and property managers in Long Beach, Sacramento, and San Jose use Plumber Comparator to reach licensed local plumbers fast. Describe the job — the unit, what the meter does with everything off, and who is authorizing the work — and request a free quote.
This is consumer guidance, not legal advice. Statutes change and local ordinances add rules of their own; check the current text of the Civil Code sections linked above, or consult a tenant-rights organization or attorney, before acting on a billing dispute.
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