Is your utility billing setup a ticking legal time bomb? Here’s what every mobile home park owner needs to know right now.

If you own a mobile home park and you’re using Ratio Utility Billing Systems — or you inherited RUBS from a prior owner — you need to read this. The regulatory ground under this common practice has shifted dramatically since 2024, and operators who don’t adapt are facing class-action lawsuits, attorney general investigations, and six-figure liability.

This isn’t hypothetical. It’s happening right now across the country.

What Is RUBS, and Why Did Everyone Use It?

For decades, Ratio Utility Billing Systems were the go-to solution for mobile home park owners who didn’t want to spring for individual submeters. Instead of measuring each resident’s exact consumption, RUBS allocated the park’s total utility bill across occupied lots using a formula — usually based on number of occupants, square footage, or an equal split.

It was cheaper to implement than submetering, easy to administer, and widely accepted. Then the lawsuits started.

The Legal Avalanche That’s Already in Motion

The shift began accelerating in 2024 and has now reached a tipping point:

• Connecticut (2024): The Connecticut Supreme Court declared RUBS illegal for residential multiunit properties. Full stop.
• Minnesota (January 2025): RUBS banned for electricity. Strict no-markup mandates on water and gas.
• Arizona (mid-2025): The state Attorney General issued consumer protection alerts warning mobile home park operators about RUBS overbilling exposure — and secured refunds for residents at a Tucson park that had been overcharging for water for years.
• California (October 2025): A property management company paid $495,000 in a settlement after using RUBS to disguise rent increases that exceeded the state’s Tenant Protection Act cap.
• Ohio Supreme Court (April 2026): A landmark ruling declared submetering companies in manufactured housing communities to be public utilities subject to state rate oversight. This ruling is now being cited in lawsuits in Arizona, California, Indiana, and elsewhere.
• Active class-action lawsuits: Currently in Arizona, California, and Indiana — targeting mobile home park-specific RUBS practices.

If you think this is a coastal problem that won’t touch your Southeast portfolio, think again. The legal arguments being made in these cases are portable across state lines.

The Core Legal Argument Against RUBS

Here’s why RUBS are increasingly vulnerable: courts and regulators are distinguishing between a landlord passing through actual utility costs versus charging tenants more than the landlord actually paid. Any administrative markup — even a few percent — is increasingly being characterized as:

1. An unlawful rent increase (in rent-controlled states)
2. Consumer fraud (under consumer protection statutes)
3. Utility resale without a license (in states that regulate utility resellers)

The most dangerous version of this: if your park is in a state that hasn’t explicitly banned RUBS yet, you may still be exposed under existing consumer protection law. Your billing practices were set up years ago. The legal landscape has changed. You might not know.

What “Compliance” Actually Requires in 2026

Regulators and courts across the country are converging on a baseline standard:

• Individual submetering as the preferred (and in some states, required) billing method
• Zero markups above the actual utility cost charged by the utility company
• Fully itemized bills showing opening/closing meter reads, dates, and calculation methodology
• Clear lease disclosures of the billing method, signed before move-in
• Advance written notice (typically 30 days minimum) before changing billing methods

If your current billing setup doesn’t meet all five of these criteria, you have exposure.

The Submetering Argument — Why It’s Not Just Legal Protection

Beyond compliance, submetering makes financial sense:

• 20–40% reduction in total water usage — residents conserve more when they see their actual usage
• Immediate leak detection — instead of discovering a slab leak when the utility bill doubles, you see it in individual meter data in real time
• Higher asset value — parks with individual meters are more attractive to institutional buyers during exit
• Simpler billing — no formulas to defend, no allocation disputes

The upfront cost of submetering ($300–$600 per meter installed) is typically recovered within 18–36 months through usage reduction and reduced administrative headaches.

How to Audit Your Current Exposure

Start here:

1. Identify your state’s current RUBS legality — this varies and is changing fast. What’s legal today in Tennessee may not be in 18 months.
2. Review your leases — does your current lease disclose the billing method clearly? Was it signed with that disclosure in place?
3. Check your billing history — are you charging any administrative fee or markup above pass-through cost? Even a “processing fee” can be problematic.
4. Talk to an mobile home park-specialized attorney — not a general real estate attorney. Someone who tracks manufactured housing statutes.
5. Contact your state Manufactured Housing Association — state MHAs often have guidance documents on compliant billing practices.

Utility billing compliance is also one of the items covered in our Mobile Home Park Due Diligence Playbook — a free resource that walks through the critical systems and legal exposures to evaluate before acquiring any community.

What We’re Doing at Keel Team

We operate 50+ mobile home parks across the Southeast. RUBS exposure was one of the first things we tackled when the legal environment started shifting. Here’s our approach:

• Full billing audit across our portfolio, state by state
• Submetering installed in parks where we had the highest exposure
• Lease addenda updated with clear utility billing disclosures
• Ongoing monitoring of state-level regulatory changes through our legal network

We’re not sharing this to lecture anyone. We went through the same learning curve. But we’d rather every operator in our industry gets ahead of this — because a wave of class-action lawsuits isn’t good for anyone.

Bottom Line

If you own a mobile home park and you’re using RUBS — or you haven’t reviewed your billing practices since you acquired the property — you’re overdue for an audit. The legal exposure is real, it’s accelerating, and the operators who get caught off guard will pay for it.

The good news: the fix is straightforward. Audit, disclose, submeter where you can, and update your leases. Do it now, before someone else forces you to.

Have questions about utility billing compliance in your mobile home park portfolio? Contact us at Keel Team — we’re happy to share what we’ve learned.