If you own a mobile home park and you’re still running RUBS to bill back utilities to your tenants, this is the most important article you’ll read this year.

I’m not being dramatic. A California property management company paid a $495,000 settlement in late 2025 for using RUBS billing. The Arizona Attorney General sent formal warning letters to mobile home park operators statewide in August 2025. Minnesota banned RUBS for electricity outright, effective January 2025. And more states are lining up.

The utility billing playbook that generated returns for mobile home park investors for two decades is actively being dismantled — and most operators are either unaware or hoping the problem passes before it reaches their state.

It won’t.

What Is RUBS and Why Did Everyone Use It?

RUBS — Ratio Utility Billing Systems — lets a park owner take the master utility bill (water, sewer, trash, sometimes electric) and divide it among tenants using a formula. Usually it’s split by occupied lots, square footage, or occupancy count.

For decades, it worked well enough. Mom-and-pop owners didn’t bother with submeters. Institutional buyers would acquire these parks and implement RUBS as part of the value-add strategy — flip utilities to tenants, increase NOI by $500–1,000/month or more, watch the valuation jump.

The problem: RUBS has no direct link to actual individual usage. A single person living alone might pay the same as a family of five. And when master bills spike — which they have, with water/sewer rates up 24% nationally between 2019 and 2024 — tenants end up absorbing big increases with no recourse. Tenant advocates noticed. Lawyers noticed. State legislatures noticed.

The Legal Landscape Is Shifting Fast

Here’s what’s already happened:

• Minnesota (Jan 2025): Banned RUBS for electricity billing in manufactured housing communities
• California (Oct 2025): $495,000 class-action settlement against an operator for RUBS billing; additional legislation now requires itemized utility disclosure and limits pass-through charges
• Arizona (Aug 2025): Attorney General formally reminded all park operators of submetering obligations; enforcement escalating
• Multiple states: New laws requiring line-item utility transparency, limiting administrative surcharges, and in some cases requiring individual meters for new tenants

If you’re operating in a regulated state, the liability isn’t theoretical — it’s a matter of when, not if, someone files a complaint or a class action.

The Real Operational Problem: You’re Flying Blind

Beyond the legal risk, here’s what most operators don’t talk about: RUBS masks a massive financial problem.

When you’re on a master meter with no individual submeters, you have zero visibility into where your water goes. Industry data shows that parks running master-metered systems lose 20–40% of total water consumption to leaks — underground line breaks, running toilets in vacant units, slow drips that accumulate over months.

A single running toilet wastes over 20,000 gallons per month. At $0.01/gallon (a rough average for combined water/sewer), that’s $200/month per unit on a problem you can’t detect. Multiply that across a 100-space park with three or four leaking units and you’re hemorrhaging $600–800/month that you’re eating entirely.

With submeters, that leak shows up immediately as a usage spike on one lot. You can fix it in days instead of months.

The Business Case for Converting

Let me give you the numbers that have convinced every operator we’ve talked to:

• Submeter installation: $300–500/lot (water only); roughly $30,000–50,000 for a 100-space park
• Typical water savings post-conversion: 20–30% of total consumption
• NOI lift (on a 100-space park paying $8,000/month in water/sewer): $1,600–2,400/month in savings
• Annual NOI increase: $19,200–28,800
• Value created at a 6.5% cap rate: $295,000–443,000

The hardware pays for itself in under 12 months. The equity creation is immediate. To see how NOI gains translate to property value, see our breakdown of mobile home park cap rates.

How to Execute the Conversion

Step 1: Get a legal opinion specific to your state. Don’t assume you know the rules. RUBS legality varies by state, county, and sometimes municipality. Pay $300–500 for a real estate attorney to review your current billing setup and tell you exactly what exposure you have. Worth every penny.

Step 2: Assess your infrastructure. Before ordering meters, know what you’re working with. Have a licensed plumber camera-scope your main lines. If you’ve got Orangeburg pipe or 40-year-old galvanized steel underground, you need to factor repair costs into your conversion timeline. Putting $400 meters on a failing line doesn’t make sense. This infrastructure review is a standard part of any thorough acquisition process — if you’re buying a park today, it should already be on your checklist. We cover utility infrastructure inspection in depth in our Mobile Home Park Due Diligence Playbook.

Step 3: Choose a submeter vendor. The market has matured — you don’t need to cobble together a solution. Companies like Metron Farnier, SimpleSubwater, and others offer full-stack packages: hardware installation, cloud-based billing dashboards, leak detection alerts, tenant-facing portals, and compliance-ready billing statements. Get three quotes and check references.

Step 4: Notify tenants properly. Most states require written notice before you change how utilities are billed — often 30–60 days. Do this right. Have your attorney draft the tenant notice. Communicate the change as a transparency improvement, not a gotcha.

Step 5: Pilot on a section first. If you’re nervous, convert one section of the park (20–30 lots) first. Measure the results. Most operators see immediate consumption drops and validation of the ROI model within 60–90 days.

What If You’re Still Running RUBS During the Transition?

At minimum, do this: start providing tenants with a copy of the master utility bill each month alongside their RUBS charge. Document your allocation methodology in writing. Have a clear, defensible admin fee structure.

This doesn’t eliminate legal risk, but it demonstrates good faith and transparency — the two things that typically defuse tenant complaints before they become lawsuits.

The Bottom Line

RUBS as a long-term strategy is over. The operators who move first to submetering will:

1. Eliminate legal liability
2. Gain operational visibility they’ve never had
3. Create significant equity value through NOI improvement
4. Actually improve tenant relationships with transparent, fair billing

For context on how utility costs fit into overall returns, see our post on how expense management impacts mobile home park returns.

At Keel Team, we’ve been proactive about this across our portfolio. The parks we’ve converted to submetering are cleaner operationally, have fewer billing disputes, and are worth more at exit than they would be running RUBS.

If you haven’t started the conversation yet, start it tomorrow.

Andrew Keel is the founder of Keel Team Real Estate Investments, which owns and operates 50+ mobile home parks across the U.S. For questions about utility infrastructure or mobile home park investing, visit keelteam.com.