When a Congress Park home goes under contract, its water service line rarely comes up, because the neighborhood is known for having been near the front of Denver Water's replacement program. That reputation is about the neighborhood. The lead line itself is a question about one house. Denver Water can only replace a customer-owned line after someone at the property signs a consent form. When that never happened, the house stays on a follow-up list, and a change of ownership puts it back in front of the utility.
So for a buyer, the question can't be answered by asking whether Denver Water has finished in Congress Park. The useful question is whether this particular house still has lead and whether the last owner ever said yes. A seller is better off answering that before a buyer asks.
An early start leaves leftovers behind
Congress Park was on Denver Water's 2022 list of neighborhoods where crews would replace lead lines, together with City Park, Clayton, East Colfax, Park Hill and several others. By June 2024, Denverite reported that Congress Park, East Colfax and South Park Hill each had more than 1,000 replacements.
The same article listed the neighborhoods that Denver Water's preliminary data showed as about 90 percent finished as of March 2024: Baker, Barnum West, City Park, Clayton, East Colfax, Elyria Swansea, Skyland and Whittier. Congress Park was not on that list. Those figures are more than two years old. Congress Park saw a lot of work early, and a high count of finished replacements says nothing about which addresses are still waiting.
Across the whole service area, Denver Water's semi-annual report estimates 57,405 lead service lines in its inventory as of June 30, 2026. Of those, 39,060 had been replaced since the program began, and 18,345 lead or galvanized lines still needed replacement. The utility's dashboard for January 1 through September 30, 2026, shows 3,543 replacements so far this year against an annual target of 4,477. The program is still working through thousands of homes a year. A neighborhood it visited early has had more time to pile up the exceptions.
How one house gets skipped
The service line belongs to the property owner, running from the main in the street to the home. Because of that, Denver Water needs a signed consent form before it can do anything, and an owner, a tenant or an authorized representative can sign. Crews need to get inside and outside the house, and an adult age 18 or older has to be there while the work is done.
Most people sign. In the first half of 2026, Denver Water logged 4,223 properties that gave consent and 25 that refused or never responded. The utility tries to reach the owner several times by mail, email, phone and door-to-door visits. A property that is still silent when the crew wraps up the work area goes onto the Refusal List as non-responsive. The report says non-responsive properties get a water shutoff warning about 45 days before replacements begin in the neighborhood, then a 15-day shutoff notice.
A signed form can still stall. If an inspection turns up a safety or security hazard that blocks the work, the owner has 14 days to fix it. After that, the property is treated as non-responsive until the problem is resolved. An owner who had an earlier replacement nobody recorded can be asked for documentation so the property can come off the list.
That covers the ways a house can sit on a block that was otherwise finished years ago.
A sale puts the house back on Denver Water's list
Denver Water's 2026 semi-annual report says that any change in ownership triggers more outreach to get consent. Between January 1 and June 30, 2026, 14 properties on the Refusal List changed owners, and the utility is following up to get the new owner's consent within a year of the sale. Its contractors also work in "newly consented properties" next to their current work areas, including homes where a new owner said yes.
For a Congress Park buyer, this means the earlier owner's decision becomes yours at closing. Because consent to replace is the main thing standing in the way, a buyer who signs can usually turn a lead line into a scheduling question. The timing is still Denver Water's call, though. Its 2026 to 2031 work-area map says timing "could change" and calls it "not a guaranteed timeline."
The kitchen can also give you a clue. Denver Water sends households that may have a lead line a free water pitcher, a filter and replacement filters, and keeps supplying them until six months after the line is replaced. If you see a Denver Water pitcher during a showing, ask the seller when the line was replaced or whether it has been replaced at all.
Matching the address to the next step
Denver Water says homes built before 1951 are more likely to have lead service lines, so the build year on the listing is the first clue. The first step costs nothing. Enter the address in Denver Water's service line lookup map, which is linked from its Lead Reduction Program page. Then use the current projects map to see where crews are working.
| Situation at the address | What Denver Water's rules say | Question to settle during the transaction |
|---|---|---|
| Line already replaced through the program | Filters continue for six months after replacement | Can the seller provide the replacement date or confirmation? |
| Possible or known lead, on the refusal list | A change in ownership prompts outreach to get consent within a year | Who will sign the consent form, and when? |
| Possible or known lead, not scheduled this year or next | The owner may apply for a one-time $3,800 reimbursement before doing the work privately | Does the buyer want to wait for the program or apply? |
| Teardown or major remodel planned | Denver Water's redevelopment policy can require replacement, with a possible reimbursement exception | Has the builder checked the policy before pricing the project? |
| Line material already evaluated by the owner | Denver Water has a self-reporting tool for line material | Was the result reported, and is there documentation? |
The reimbursement has firm conditions. The applicant must own the property, the line must be entirely or partly lead, and the application must be approved before the work starts. The property can't be on Denver Water's schedule for the current or next calendar year. A partial replacement qualifies only if no lead is left anywhere in the line. The $3,800 is described as about half of the utility's cost for a replacement. Details are on Denver Water's reimbursement page and its redevelopment guidance. Owners who have already had the line checked can use the self-reporting process.
What the Colorado disclosure form asks
Colorado's residential Seller's Property Disclosure has been mandatory since January 1, 2026. Its water section has no checkbox for lead service line material. The form does ask about galvanized pipe and plumbing problems. It also says known adverse material facts must be disclosed even when the form has no item for them. Denver Water's remaining-replacement count includes galvanized lines that require replacement, which is one reason the plumbing questions on the form matter here.
The federal disclosure most buyers have heard of is a different rule. The EPA's real estate disclosure requirements cover known lead-based paint and paint hazards in most housing built before 1978. They don't cover drinking water service lines.
This is general information and not legal or financial advice. Sellers should confirm what applies to their own home with a real estate attorney, and buyers should do the same with their own advisors.
The program has an end date, and your home has its own timing
Under the EPA's Lead and Copper Rule Improvements, water systems must have a baseline inventory and replacement plan by November 1, 2027. The rule then generally requires full replacement within 10 years. Denver Water's current variance lets its program run through January 1, 2035.
Those dates apply to the program as a whole. For a single Congress Park house, the timing depends on consent, the work-area schedule and whether a hazard on site stands in the way. A buyer closing this fall can learn most of that from the lookup map and a direct question to the seller, before the inspection period ends.
Quick answers
Does replacement cost the homeowner anything? Denver Water says it replaces customer-owned lead lines through the program at no direct cost to the customer. Homeowners still have to sign the consent form and provide access.
The house was built after 1951. Does any of this apply? Denver Water calls pre-1951 homes more likely to have lead lines, which is a probability and not a cutoff. The address lookup gives the actual answer.
How long do the free filters keep coming? Denver Water mails replacement cartridges until six months after the line is replaced. Each filter is meant to be changed every six months.
Whether you're about to list a pre-1951 Congress Park home or are thinking about an offer on one, Dianne Goldsmith can help you look up the service line record, collect replacement paperwork for the disclosure and inspection stages, and settle the consent question before closing day. When you're ready for a pricing conversation, start with your free home valuation.
