When evaluating a mobile home park for acquisition, experienced operators know that one factor towers above all others in determining long-term profitability and risk: utility infrastructure. Specifically, whether a community is connected to city water and city sewer versus relying on private systems like wells, septic tanks, or lagoons can make or break an investment.

Utility infrastructure affects virtually every dimension of mobile home park ownership—from operating expenses and capital expenditure risk to regulatory exposure and resale value. Understanding why city water and city sewer matter so much is essential for anyone conducting due diligence on a mobile home park.

The Three Utility Configurations You Will Encounter

Mobile home parks typically fall into one of three utility categories:

• City water and city sewer — The community is connected to municipal water and wastewater systems. The city or utility district owns, operates, and maintains the infrastructure beyond the meter.
• Private water and/or septic systems — The park owner operates a private well for water and individual or shared septic systems for wastewater. The owner bears full responsibility for maintenance, compliance, and replacement.
• Lagoon systems — A type of private wastewater treatment where effluent is collected in open-air ponds for biological treatment. Lagoons are among the most operationally intensive and costly configurations.

Each configuration carries dramatically different risk and cost profiles. Understanding these differences is the foundation of sound mobile home park due diligence.

Why City Water and City Sewer Are Superior

1. Lower Operating Costs

With city water and city sewer, the municipality handles treatment, maintenance, and regulatory compliance for the water and wastewater systems. The park owner simply pays a monthly utility bill. There are no pump-outs, no lift station repairs, no DEQ inspections to manage, and no emergency calls when a system fails at 2 a.m.

By contrast, private septic systems require regular pump-outs (typically every three to five years per unit), drain field repairs, and eventual full-system replacements that can cost $10,000 to $25,000 per lot. Lagoon systems demand ongoing aeration, sludge removal, water quality testing, and regulatory reporting—all of which require specialized contractors or licensed operators.

On a per-lot basis, annual maintenance costs for city sewer connections typically run around $150 to $200. Septic systems average $400 to $550 per lot annually when you amortize replacement costs. Lagoon systems can exceed $600 per lot per year when factoring in operational expenses, regulatory compliance, and capital reserves.

2. Reduced Capital Expenditure Risk

One of the most dangerous surprises in mobile home park ownership is an unexpected capital call from a failing private utility system. A community-wide septic failure or a lagoon that falls out of compliance can trigger six-figure remediation costs with little warning.

City infrastructure eliminates this category of risk almost entirely. The municipality is responsible for the treatment plant, the mains, and the distribution system. The park owner’s responsibility typically ends at the meter or the point of connection. While you may still face costs for internal water lines or sewer laterals within the park, these are manageable and predictable expenses compared to replacing an entire private system.

3. Regulatory and Environmental Liability

Private water and sewer systems are subject to state and federal environmental regulations. Operating a private well means compliance with Safe Drinking Water Act standards. Running a lagoon or package treatment plant means discharge permits, water quality monitoring, and potential EPA or state DEQ enforcement actions.

Non-compliance penalties can be severe—fines of $10,000 or more per day are not uncommon for wastewater violations. More importantly, environmental remediation for contaminated soil or groundwater from a failed system can cost hundreds of thousands of dollars.

With city water and city sewer, the regulatory burden shifts to the municipality. The park owner avoids the operational complexity, legal exposure, and financial risk associated with maintaining compliance on private systems.

4. Impact on Occupancy and Resident Satisfaction

Residents in mobile home parks served by city water and city sewer generally experience more reliable service, better water quality, and fewer disruptions. Private well water can have taste, odor, or hardness issues that drive resident complaints. Septic backups and lagoon odors are among the most common reasons residents cite for leaving a community.

Reliable utility service supports occupancy stability, which is the engine of mobile home park cash flow. Every vacant lot represents lost revenue, and utility problems are one of the fastest ways to trigger move-outs.

5. Financing and Resale Value

Lenders and buyers strongly prefer mobile home parks on city water and city sewer. Agency lenders—Fannie Mae and Freddie Mac through their manufactured housing community loan programs—generally require municipal utilities or at minimum a clear path to connection. CMBS and bank lenders also apply lower risk premiums to communities with city services.

This preference translates directly into valuation. A mobile home park on city water and city sewer will typically command a lower cap rate (higher price) than an otherwise identical community on private systems. The difference can be 50 to 150 basis points, which on a property generating $200,000 in net operating income represents a valuation difference of $150,000 to $500,000 or more.

When it comes time to sell, the buyer pool for a city-utility community is significantly larger and more competitive than for a property burdened with private infrastructure.

What to Look for During Due Diligence

When evaluating a mobile home park’s utility infrastructure, consider the following:

• Verify the utility provider. Confirm directly with the city or utility district that the park is connected to municipal water and sewer. Do not rely solely on seller representations.
• Review utility bills. Obtain 12 to 24 months of water and sewer bills to understand cost trends and identify anomalies that might indicate leaks or billing disputes.
• Inspect internal infrastructure. Even on city utilities, the internal distribution lines within the park are the owner’s responsibility. Assess the age, material, and condition of water mains, sewer laterals, and cleanouts throughout the community.
• Check for conversion potential. If a park is currently on private systems, investigate whether city water and sewer lines are accessible nearby. The cost of connecting to municipal services can sometimes be justified by the resulting reduction in operating costs and increase in property value.
• Understand billing structure. Determine whether the park is master-metered or individually metered, and whether utility costs can be passed through to residents or must be sub-metered under state regulations.

For a comprehensive framework covering utility evaluation and every other critical element of mobile home park analysis, the Keel Team Due Diligence Playbook walks through each step in detail.

The Bottom Line

Utility infrastructure is not glamorous, and it rarely makes the highlight reel of a mobile home park listing. But it is arguably the single most important factor in determining the risk-adjusted return of a mobile home park investment. City water and city sewer dramatically reduce operating costs, eliminate categories of capital expenditure risk, minimize regulatory and environmental exposure, support occupancy stability, and enhance both financing options and resale value.

Before evaluating occupancy rates, rent rolls, or market demographics, start with the utilities. If a mobile home park is not on city water and city sewer, every other number in your analysis needs to be viewed through the lens of the additional risk and cost that private infrastructure introduces. The best operators in the mobile home park industry know this—and they underwrite accordingly.