Most mobile home park investors are focused on cap rates, lot rents, and occupancy. That’s the right focus — until it isn’t.

There’s a compliance clock running in the background for every park operating its own private water system. Most operators don’t know it exists. Several of the deadlines have already passed.

Here’s what it is, who it applies to, and what to do about it.

What the EPA Changed in October 2024

The EPA finalized the Lead and Copper Rule Improvements (LCRI) in October 2024. The rule applies to every Community Water System in the United States — a category that includes any mobile home park operating its own private well, master meter, or private water distribution system.

The core requirement: full replacement of all lead service lines within 10 years, with specific documentation milestones along the way.

This isn’t theoretical. The deadlines are already in motion.

The Timeline You Need on Your Calendar

October 16, 2024 — Initial Inventory Deadline (Already Passed)

Every affected park was required to submit an inventory of all service line materials (lead, galvanized, unknown, or safe) to their state’s primacy agency. This inventory must also be made publicly available.

If you own a park with a private water system and don’t have this documented, you’re already past the first compliance deadline.

December 31, 2025 — First Annual Public Notice (Already Passed)

Parks with lead, galvanized-requiring-replacement (GRR), or unknown service lines were required to send annual public notices to residents. If this didn’t happen, it needs to be addressed before the 2026 notice deadline.

December 31, 2026 — Second Annual Public Notice (Coming This Year)

If your park has any lead, GRR, or unknown service lines, residents must receive written notice by year-end. Calendar this now.

November 1, 2027 — Baseline Inventory + Full Replacement Plan

This is the biggest near-term deadline. A comprehensive baseline inventory and a full Lead Service Line Replacement Plan must be submitted to your state. This marks the official start of the federally mandated 10-year replacement window.

November 1, 2037 — Full Replacement Required

All lead service lines must be fully replaced. Parks are required to replace at a minimum rate of 10% per year (3-year running average) starting from October 2027.

Who This Actually Affects

If your park connects directly to a municipal water system and residents have their own connections from the city line — you’re likely not the regulated entity here. The municipality handles it.

If your park operates a private water system of any kind — a private well, a master meter with internal distribution lines, or a private pump — you’re a Community Water System under this rule, and it applies to you.

Parks built before 1986 face the highest risk. Lead solder and lead pipe were standard before the 1986 Safe Drinking Water Act amendments banned them. A park built in 1972 with original plumbing may have lead service lines that nobody has thought about in 50 years.

What This Costs

This is where the numbers get serious:

• Professional service line material assessment: $2,000–$8,000 depending on park size
• Partial lead service line replacement (some lines): $15,000–$75,000
• Full private water system replacement: $100,000–$350,000
• Septic system replacement (if combined with water issues): $50,000+

These aren’t worst-case numbers. These are the ranges we’ve seen quoted in our own due diligence work.

What This Means for Acquisitions

If you’re under contract on a park with a private water system right now, LCRI compliance status needs to be on your due diligence checklist. Specifically:

1. Request LCRI compliance documentation from the seller. Has the Oct 2024 inventory been filed? Was the Dec 2025 annual notice sent? If the seller can’t produce documentation, assume non-compliance and price accordingly.
2. Verify compliance status directly with the state primacy agency. Your state’s drinking water program maintains records. A phone call or records request before closing is worth the effort.
3. Commission a service line material assessment. A licensed engineer can assess the park’s water system and identify what material the service lines are made of. This is now standard due diligence on any private-system acquisition.
4. Model the worst case. If the park has lead service lines that require full replacement under the 10-year window, build that cost ($100K–$350K) into your underwriting. It’s not a dealbreaker, but it can’t be a surprise at year three.

The Simple Screen That Avoids All of This

The cleanest play: prioritize acquisitions with city water AND city sewer. Parks connected to municipal utility systems don’t carry this private-system regulatory exposure. The municipality is the water system operator — not you.

At Keel Team, city water and city sewer is part of our core acquisition criteria. The LCRI makes this preference even more strategically sound. Private systems can pencil — but they require deeper diligence, more conservative underwriting, and ongoing compliance management that most operators underestimate.

What To Do This Week

If You Own Parks with Private Water Systems:

1. Pull your state primacy agency’s records and verify your LCRI compliance status
2. If you didn’t file the October 2024 inventory, contact your state drinking water program to understand cure options
3. Ensure December 2026 public notices are calendared for every park with lead, GRR, or unknown service lines
4. Engage a civil/environmental engineer for a service line material assessment if you don’t already have one
5. Build the November 2027 baseline inventory and replacement plan submission into your project calendar now

If You’re Evaluating an Acquisition:

1. Add LCRI compliance documentation to your standard DD checklist
2. Request seller representations on water system compliance in your PSA
3. Model remediation costs as a capital expense in your underwriting

The operators who treat this as a future problem will be managing it as a crisis when the 2027 deadline arrives. The operators who get ahead of it now will have clean documentation, a funded capital plan, and a more defensible portfolio.

This is fixable. But the window to fix it on your own schedule — rather than a state enforcement agency’s schedule — is closing.

Water system due diligence — including private well inspections, LCRI compliance review, and water quality testing protocols — is covered in detail in the Mobile Home Park Due Diligence Playbook.

Andrew Keel is CEO of Keel Team Mobile Home Park Investments, a private equity firm focused on manufactured housing communities. Keel Team owns and operates 50+ mobile home parks across the Southeast and Midwest.