The Compliance Rules
Behind Every Bill
Before any bill issues, Sentinel checks it against every applicable law, regulation and utility rule, plus an audit standard of our own. Every rule drawn from law is tied to the provision it enforces.
For the full regulatory breakdown of each rule, see our compliance guide.
Meter Readings on Bill
Residents can verify every charge themselves — the opening and closing readings and the charge for the period appear on the bill, which reduces disputes before they reach your office.
CARE Discount Passthrough
Residents who have qualified for CARE receive the full CARE discount, noted on their statement.
FERA Discount Passthrough
Residents enrolled in FERA — households earning 200–250% of the federal poverty guideline, at PG&E, SCE or SDG&E — receive the 18% FERA electric discount on their submetered bill, exactly as if the utility billed them directly.
Cal. Pub. Util. Code § 739.5(a); § 739.12(a)–(b)No Markup Above Utility Rates
No markup on gas, electric or water: gas and electricity from an investor-owned utility (including community-choice electricity) are billed at exactly the rate the utility would charge the resident directly, and water only by the methods the Civil Code allows, plus at most its capped billing fee.
Cal. Pub. Util. Code § 739.5(a) · Cal. Civ. Code § 798.40(c)Separate Itemization
Electric, gas, water, and sewer appear as separately stated charges — making disputes quick to resolve and rate parity simple to demonstrate.
Cal. Civ. Code § 798.41(a), (d)Billing Agent Disclosure
The billing agent's name, address, and telephone number appear on every resident's bill.
Cal. Civ. Code § 798.40(b)Common Area Metering Disclosure
If a meter on a resident's space also measures common-area equipment or lighting, management must disclose it and either compensate the resident by written agreement or stop using that meter for the common area.
Cal. Civ. Code § 798.43(a)Tier-by-Tier Rate Parity
Every usage tier is checked against the direct-service tariff rate for the same schedule and period — not just the bill's total.
Cal. Pub. Util. Code § 739.5(a)Income-Graded Fixed Charges
CARE- and FERA-enrolled residents are billed the income-graded fixed charge (a daily charge, shown monthly on most bills) at their program's tier — never the standard tier.
Cal. Pub. Util. Code § 739.5(a) · CPUC Decision 24-05-028Master-Bill Ceiling
For water and sewer, common-area use is never charged to residents, and where a community without submeters divides its water or sewer bill, residents' shares together never exceed what the utility charged (our reading of § 798.41(a)). There is no master-bill ceiling on gas or electric; the ceiling is each resident's direct-service rate (§ 739.5(a)). Residents' charges can total more than the master bill; that is lawful — the master-meter discount is the community's compensation.
Cal. Civ. Code §§ 798.40(c)(1)(D), 798.41(a)Water Billed Only by the Statute's Methods
Since 2022, submetered water can be billed only by the methods Civil Code § 798.40(c) lists — a metered share of the community's own water bill, or the water company's own tier or per-space rates as charged to the community — never a residential rate schedule applied as if the resident were the water company's customer, never common-area water, and with the billing fee capped by statute.
Cal. Civ. Code § 798.40(c), (f) (AB 1061, Stats. 2021, ch. 625; AB 604, Stats. 2023, ch. 807)Tiered Water at the Water Company's Own Tier Rates
Where the water company bills the community on tiers, each tier's volume may be split evenly among the spaces and each home's metered use priced at the water company's own tier rates as charged to the community. Sentinel checks every price against the rate in force on each day, and the billing fee against its cap.
Cal. Civ. Code § 798.40(c)(1)(B), (c)(3)One-Price Water
Where the water company charges the community one price per unit, each home's water is its own metered use at that price — the same result as the statute's share-of-the-bill method — so it can be priced before the bill arrives, never above that price, with the billing fee capped.
Cal. Civ. Code § 798.40(c)(1)(A), (c)(3)Sewer at the City's Adopted Rate
Where the city charges sewer at an adopted rate on a share of water use, each home's sewer is that rate on the same share of its own metered water — never more — and any flat sewer amount the community has attested reproduces exactly for the days billed.
Cal. Civ. Code § 798.40(c)(1)(A), (d)(3)Community-Supplied Propane and Well Water
Where management does not permit residents to buy propane from anyone else, or federal, state or local law (such as setback rules) stops them installing their own tanks, the price may not exceed 110 percent of the actual price paid by the management, and that actual price is posted in a visible location. Well water has no statutory price cap; its rates must be just and reasonable, which the CPUC decides if residents complain. Our audit standard: every charge traces to the price the community set and attested.
Cal. Civ. Code § 798.44(a), (b), (e) · Cal. Pub. Util. Code § 2705.6Community-Provided Services
A charge for a service the community provides itself — such as its own septic system, with no utility billing it — is an incidental, reasonable charge for a service actually rendered, with 60 days' written notice first if the rental agreement does not list it. Our audit standard: it traces to the amount the community attested and never exceeds it.
Cal. Civ. Code §§ 798.31, 798.32Utility Conversion Rent Offset
When a utility is moved out of rent, separately billed charges are not rent only if the rent is reduced at the first separate bill by the average the utility charged the community for that space over the 12 months before the notice. Agreements entered into before 1991 are exempt until extended or renewed.
Cal. Civ. Code § 798.41(a)–(b)Flat Pass-Through Traceability
A provider's flat charge, like trash, passes through at what the provider charged, separately stated, with an expiration date if it is limited. Our audit standard: each traces to the documented amount and is prorated only downward.
Cal. Civ. Code § 798.41(a), (d)Los Angeles: Never Above LADWP
At a community the Los Angeles Department of Water and Power serves, residents pay no more than if LADWP served them directly, and no fee of any kind related to submetering is added. Our audit standard: each resident's electric and water charge is checked against what LADWP would charge that resident directly, and the city's sewer charge is the City's actual dollars, divided — never recalculated.
LADWP Rules Governing Water and Electric Service, Rule 18.C.2 · Cal. Civ. Code § 798.40(d)Rate Schedule Reference
Every rate-priced charge cites the rate schedule used, so it can be independently verified in seconds.
Internal audit standardWant the rules utility by utility, with statute citations and where bills commonly go wrong? Read the California rules guide →
Go Deeper, Statute by Statute
Civil Code § 798.40
Separate statement, meter readings, billing-agent disclosure — and the water-service billing limits, including the (c)(3) fee cap.
Civil Code § 798.41
Converting bundled utilities to separate billing, the rent reduction that keeps separate charges from counting as rent, and flat pass-through limits.
Civil Code § 798.43.1
The CARE discount in master-metered communities — the annual notice, application assistance, and the 100% passthrough.
Public Utilities Code § 739.5
The same-rate rule for submetered gas and electric — tier parity, the master-meter discount, and rebate passthrough.
And for the § 798.40(c)(3) administrative fee, compute the maximum at the $4.75 base with the water fee cap calculator →
The Compliance Landscape
California's manufactured housing utility billing regulations are detailed and specific. The Mobilehome Residency Law (Cal. Civ. Code §§ 798–799.13) and the Public Utilities Code (including §§ 739.5, 739.12 and 2705.6) establish specific requirements for how utility charges are calculated, disclosed, and billed to residents.
The law gives residents real remedies (§§ 798.85, 798.86), so a bill you can show your work on is worth having.
Sentinel checks every bill before it goes out, so every bill you send is one you can defend. If something needs attention, it tells you what it found, why it matters and how to fix it. The decisions that are yours stay yours. Sentinel holds a bill only for an error, or for a resident protection the law doesn't let anyone waive.
One Charge, Complete Provenance
Illustrative example — rates as filed by SCE effective October 1, 2026; not a real resident's bill. The Base Services Charge (30 days × $0.794 = $23.82) is shown as its own line.
Electric usage charge: $155.66
Resident's rate schedule: SCE Schedule D (Domestic Service), bundled, effective 2026-10-01
Cal. P.U.C. Sheet No. 91558-E, Advice 5897-E, D.26-04-033
Community's master-meter schedule: SCE DMS-2 — sets what the community pays SCE, not the resident's rate
Source document: SCE Schedule D (PDF, SHA-256 19d67a0d…a27a19d1, archived 2026-10-03)
Rate checked against the filed sheet
Meter readings: 31,204 → 31,691 = 487 kWh (Space 101, an illustrative winter period: read 2026-10-15 and 2026-11-14; 30 days)
Baseline allowance: Baseline Region 10, winter, all-electric — 15.2 kWh/day × 30 days = 456.0 kWh
Preliminary Statement Part H, Sheet No. 91544-E
Arithmetic: 456.0 kWh × $0.31384 = $143.11; 31.0 kWh over baseline × $0.40485 = $12.55
Rate per kWh = delivery + generation + Fixed Recovery Charge, Sheet 91558-E
Low-income discount: None on file (CARE or FERA applies here when the resident is enrolled)
Compliance: Every applicable rule passed
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