That single fact shapes everything about water in this sector: who gets billed, who has an incentive to conserve, who a restriction applies to, and who pays when a line breaks under a home nobody is watching. It is one of several ways manufactured housing communities work differently from other residential property. 

This article describes general operational practice and cites regulatory and industry sources where noted. It is not legal advice. Water billing, conservation requirements and drought restrictions are set locally and vary considerably. Confirm your position with your water provider and with counsel.

The Structural Problem

Arizona's Attorney General describes this arrangement in published guidance to manufactured home residents: many Arizona parks are master-meter parks, with the utility distributing to the park owner through a single meter and the owner distributing to tenants through submeters at each lot. Tenants are not direct customers of the utility company.

Three consequences follow, and they all land on the operator.

1. The bill is yours. Whatever the community uses, you pay for, and then you recover what you can.

2. Restrictions can apply to you. When a water provider imposes drought limits or an allocation, the first question is how the provider treats the master-metered account. You are the utility's customer, but the actual restrictions and allocation rules depend on the provider and jurisdiction.

3. And the conservation incentive can be weak by default. Where residents are not charged based on what they use, the marginal cost of an extra gallon to any individual household is close to zero, because the cost is shared. Vendor material makes the same point: when residents do not pay according to usage, the incentive to conserve is weaker.

What Measurement Actually Changes

EPA's WaterSense metering technical sheet cites a national study in which residents in submetered multifamily units used approximately 15 percent less water than residents in unmetered units.

Separately, submeter vendor material describes the Manufactured Housing Communities of Arizona partnering with a submetering provider, and reports community-wide water usage commonly dropping by around 25 to 30 percent after installing individual meters. That figure comes from a firm selling submetering equipment, so treat the direction as credible and the magnitude as unverified.

The same reporting attributes the reduction to two distinct causes, and the distinction matters more than the headline number:

1. Behaviour change, where residents who previously used water carelessly began conserving once they were paying for it.

2. And leaks found, both inside homes and in underground lines, that nobody had noticed because nothing was measuring them.

Leak detection is particularly valuable because it does not depend on changing resident behaviour.

Leaks Are the Larger Number

This is where the conservation argument and the financial argument converge, and it is the part most likely to be worth acting on regardless of drought.

Operator commentary from Keel Team describes the master-metered failure mode directly: a broken line under a home can run for 30 to 60 days before anyone notices, because the only signal is a bill that arrives after the fact. By the time the spike appears, the water is already in the ground.

That firm reports individual lot meters catching leaks in its own portfolio that would otherwise have run substantially longer, and describes the leak detection benefit alone as material across a multi-community portfolio.

Those are one operator's reported figures rather than an industry benchmark. But the mechanism is not in dispute. A master meter tells you the community used more water. It does not tell you which lot, and by the time you ask, the month is over.

Two operational implications.

1. Automatic meter reading changes the timescale. Keel Team's guidance recommends an AMR system rather than manual monthly reads, on the basis that automatic transmission flags leak spikes in real time rather than at the end of a billing cycle. A monthly manual read can leave you with weeks of leak before you see it.

2. And master meter monitoring is a separate thing from lot metering. Vendor material describes master meter monitoring devices intended to detect infrastructure leaks between the meter and the homes. That is the water that never reaches a lot at all, and lot submeters will never find it.

Where Your Water Actually Goes

Before responding to a restriction, know your own consumption. Four categories, and most operators can only see the total.

Individual home use, which submeters measure and master meters do not.

Irrigation and common areas, which are entirely yours and are the most visible target in a drought.

Amenities, particularly a pool, which is both a consumption item and a visible one when neighbours are being asked to save.

And distribution loss, the gap between what the master meter records and what the lot meters record. In a community with aging pipes, this can be substantial and it is invisible without both sets of readings.

That last figure is the one worth calculating. If you have submeters, compare their total against the master meter monthly. The difference is either loss, or unmetered common use, or a measurement problem, and each requires a different response. Keeping utility and asset data against the property record rather than in a billing system alone is what makes that comparison possible month to month. 

When Restrictions Arrive

Drought restrictions vary enormously by provider and by jurisdiction, so the specifics have to come from your own water authority. The structural questions are the same everywhere.

Who does the restriction apply to? You are the account holder. Whether the provider expects you to reduce total consumption, or expects individual households to comply with usage rules, changes what you can actually do about it.

How is an allocation calculated? Where a provider assigns a water budget per connection, a master-metered community is one connection serving many households. Whether the allocation reflects that is worth checking rather than assuming, particularly where the budget formula was designed for single-family customers.

Can you pass through a drought surcharge? That depends on your billing method, your lease and your state's rules on utility charges. Introducing a new charge or changing an allocation method is not automatically available to you, and in states with prospectus or disclosure regimes a charge you did not disclose may not be chargeable later.

What can you actually require of residents? Your community rules may address water use, but amending them runs through whatever procedure your state requires, and enforcement runs through your normal violation process. Neither is fast.

Take these to your water provider before a restriction rather than during one. The account relationship is with you, and the conversation is easier when you are not already over an allocation.

Billing Compliance Is Its Own Exposure

Worth separating out, because conservation and billing get discussed together and they carry different risks. Arizona's Attorney General's published guidance on submetering and billing obligations is unusually direct about what can go wrong. It notes that instances of overbilling and unfair eviction tactics may separately violate Arizona's consumer fraud laws, and quotes the Attorney General stating that when parks misrepresent tenants' actual usage, omit critical meter information, or deceive tenants about the appropriate rate structure, they do so at their own peril.

There is a recent enforcement example. In August 2025, the Arizona Attorney General announced that residents of Desert Haven Mobile Home Park in Tucson would receive credits after being overcharged for water utilities, identified as part of an ongoing investigation into submetering at the park. Skyline Real Estate, the operator, communicated to residents that water billing statements issued between 2017 and June 2025 did not follow the Flowing Wells Irrigation District's billing format and might otherwise not comply with Arizona law. Some credits exceeded $1,000.

The Attorney General's stated position was direct: operators and any other landlords that submeter utilities are on notice to bill correct amounts to their tenants.

What makes this useful is what the failure actually was. The issue was not simply a resident disagreeing with a bill. The operator said the billing statements did not follow the supplying district's format and might not comply with Arizona law, and that ran for eight years. That is the kind of error a third-party billing vendor can introduce and an operator can carry without noticing, which is why the compliance question is worth checking against your supplier's actual format rather than assuming your vendor has it right.

That is Arizona, and other states regulate differently. But the categories named are worth reading as a list of what regulators look at anywhere: what you billed, what the meter actually said, what information you gave the resident, and whether the rate structure was represented accurately.

Which means conservation and compliance pull in the same direction. A billing system that produces an accurate, explicable charge per lot is also the system that finds leaks and supports a defensible position if a resident complains.

What to Do Before the Next Dry Year

Six things, in order of how quickly they can be done.

1. Find out what your provider's restriction framework actually is, and whether an allocation would be calculated per connection or per household.

2. Calculate your distribution loss, if you have submeters. Master meter total against lot meter total, monthly.

3. Establish your common-area and irrigation consumption separately from household use. You cannot manage what you cannot see, and this is the portion entirely within your control.

4. Review your read cycle. If you are reading manually once a month, you are structurally weeks behind every leak.

5. Check your billing format against your supplier's, which is the specific failure the Arizona enforcement action turned on.

6. And fix the obvious losses. Running toilets and failed fixtures inside homes can be the resident's maintenance issue while still appearing on your utility bill in a master-metered community, which is a conversation worth having before a restriction makes it urgent.

Conclusion

Water in a manufactured housing community is structurally different from water in almost any other residential setting, because the operator sits between the utility and the household. The bill lands on you, the restriction lands on you, and the household with the running toilet has no reason to know about it.

Three things worth carrying away.

1. Measurement is the whole game. Without lot-level data you cannot find leaks, cannot separate household use from distribution loss, and cannot give a provider or a resident an accurate account of anything.

2. Leaks are worth pursuing independently of behaviour. Vendor and operator reporting attributes community-wide reductions to both leaks and conservation, but the leak component does not require asking anyone to change how they live.

3. And billing accuracy is a compliance question, not just a recovery one. Arizona's enforcement action turned on a billing format that did not match the supplying district's and ran for eight years. The system that bills accurately is the same system that conserves water.

Frequently Asked Questions

1. Who pays for water in a mobile home park?
In a master-metered community, the operator is the utility's customer and pays the full bill, then recovers what it can from residents through submetered billing, an allocation method or the lot rent. Arizona's Attorney General describes this arrangement directly, noting that tenants in master-meter parks are not direct customers of the utility company.

2. Does submetering reduce water use in a mobile home park?
EPA's WaterSense metering technical sheet cites a national study in which residents in submetered multifamily units used approximately 15 percent less water than residents in unmetered units. A submetering provider working with the Manufactured Housing Communities of Arizona separately reports community-wide reductions of around 25 to 30 percent, though that figure comes from a firm selling submetering equipment.

3. How do drought restrictions apply to a mobile home park?
The specifics come from your water provider, but structurally the account holder is the community rather than the residents. Whether an allocation is calculated per connection or per household, and whether a surcharge can be passed through, are questions worth resolving with your provider and your counsel before a restriction arrives.

4. How do you find a water leak in a master-metered community?
You largely cannot, which is the problem. Operator commentary describes underground leaks running 30 to 60 days in master-metered parks before a bill spike reveals them. Lot-level submetering with automatic meter reading flags an unusual consumption pattern within days. Master meter monitoring is a separate capability aimed at losses between the meter and the homes.

5. What are the compliance risks of submetered water billing?
They are real and enforced. In August 2025 the Arizona Attorney General announced credits to residents of a Tucson community after an investigation found water billing statements issued between 2017 and June 2025 did not follow the supplying irrigation district's billing format. Some credits exceeded $1,000. Check your billing format against your supplier's rather than assuming a third-party vendor has it right.