If you own a mobile home park and you’re still billing residents using RUBS — or you’re not 100% certain your current utility billing setup is legal in your state — you need to read this.

The regulatory landscape for utility billing in manufactured housing communities has shifted dramatically in the last 18 months. What was once a gray area is rapidly becoming a legal minefield. And the operators getting hit hardest are the ones who thought they were doing everything right.

What Is RUBS, and Why Is It Suddenly Dangerous?

RUBS — Ratio Utility Billing Systems — is a method of allocating shared utility costs among residents based on formulas like unit size or occupancy count. For decades, it was the de facto standard for master-metered parks where individual submeters weren’t installed.

The problem: states are banning it. And the enforcement is coming with real teeth.

Minnesota banned RUBS for electricity in January 2025. Colorado is restricting it for new construction starting in 2027. Arizona’s Attorney General issued consumer protection alerts in mid-2025 warning mobile home park operators of overbilling exposure. Class-action lawsuits are active in Arizona, California, and Indiana.

Then in April 2026, the Ohio Supreme Court dropped a landmark ruling declaring that submetering companies operating in manufactured housing communities are public utilities — subject to state rate oversight and consumer protections. The legal community called it a “watershed moment.” It’s already being cited in lawsuits in other states.

The Part That Should Keep You Up at Night

Most operators didn’t change anything in response to these shifts. Not because they’re negligent — because nobody told them.

Billing third parties have a financial incentive to keep the status quo. They profit from managing the billing. Proactively telling clients “hey, your current setup might expose you to a class-action” isn’t great for their business.

The result: thousands of mobile home park operators are sitting on potential six-figure legal exposure right now, running billing methods that are legally questionable in their state.

The math is brutal. A park billing $3,000/month in RUBS utility recovery over five years has collected $180,000. A class-action seeking damages, penalties, and attorney’s fees can quickly exceed $500,000. The asymmetry is staggering.

What Compliant Billing Actually Looks Like in 2026

Here’s the short version of what regulators are demanding across the board:

1. Individual submetering — actual consumption billed per unit, not estimated or allocated
2. No markup above actual utility cost — several states now explicitly prohibit charging admin fees above the rate charged by the utility company
3. Full transparency — itemized bills showing opening/closing meter reads, dates, and calculation method
4. Lease disclosure — billing method must be disclosed in the lease agreement before move-in
5. Written notice before changing billing methods — typically 30 days minimum

If your setup doesn’t check all five boxes, you have work to do.

Submetering: The Cost vs. The Math

The reason most operators haven’t converted to submetering is upfront cost. Individual submeter installation runs $800–$2,500 per pad depending on infrastructure age and meter type.

For a 100-lot park, that’s $80,000–$250,000. That’s a real number.

But consider what you get:

• 15–39% reduction in water consumption (residents conserve when they pay for what they use)
• Full cost recovery on utilities — instead of eating overages
• Legal protection from the class-action wave
• Early leak detection through usage monitoring, preventing five-figure repair bills
• Increased net operating income, which directly increases your park’s valuation at exit

On a $5M park at a 7-cap, every $50,000 increase in NOI adds over $700,000 in value. The submetering math often pencils out in 18–36 months purely on operating efficiency — before you even price in litigation avoidance.

Steps to Take Right Now

1. Audit your current billing method for every park you own. Write down: billing method, states, whether billing is disclosed in current leases, whether you’re using a third party.
2. Check your state’s current status. Priority states with active regulation: Minnesota, Ohio, Colorado, Arizona, California, Washington, Indiana. If you own in these states, get a real estate attorney review of your current setup within 30 days.
3. Ask your billing company point blank: “What is our exposure under current state law, and what are you doing to keep us compliant?” If they can’t give you a clear answer, that tells you everything you need to know.
4. Model the submetering conversion. Get quotes for installation at each park, model the utility cost recovery improvement, and include litigation avoidance value in your ROI calculation.
5. Update your leases. Even if you’re not converting immediately, make sure your current billing method is properly disclosed in all current and renewal leases.

The operators who are proactive on this will avoid a nightmare. The ones who wait until they get served with a class-action will wish they’d paid attention.

The regulatory wave is real. The lawsuits are real. The question is whether your park is in front of it or behind it.

Keel Team specializes in the acquisition and operation of mobile home parks in the Southeast and Midwest. We’ve owned and operated 50+ communities and stay current on the regulatory shifts that affect our industry. For a comprehensive framework on evaluating utility infrastructure before you acquire a community, see our Mobile Home Park Due Diligence Playbook.

Related Reading

Utility billing compliance is just one piece of a thorough mobile home park due diligence process. These resources cover the broader landscape:

• Mobile home park utility infrastructure — A deep dive into water, sewer, and private utility systems and what to look for before you buy.
• The #1 due diligence mistake costing mobile home park investors $50,000–$200,000 — The most common (and most expensive) error new operators make during inspection periods.
• How to value a mobile home park — Step-by-step guide to calculating NOI and cap rates before making an offer.