Lead Water Lines in Denver: How Agents Can Check Any Address Before the Buyer Asks

Jerad Larkin

2 hours ago

8 min read

How can a Denver agent check whether a home has a lead water line?

Enter the address into Denver Water's lead service line map at denverwater.org/lead. Denver Water estimates 60,000 to 64,000 homes in its service area may have one, and homes built before 1951 are the most likely.

Sooner or later a buyer is going to ask you about the water line on a 1940s Denver bungalow. Not the water heater. The pipe that runs from the main in the street to the house.

Most agents I talk to have never looked this up, and I get why. It is not a field in the MLS, it is not a line in the contract, and nobody covered it in pre-licensing. But Denver Water has a public address lookup, a free replacement program, and a published schedule, and all of it is useful the day a buyer asks.

This post is the two-minute check, what the result does and does not tell you, and the wording I would use with a buyer or a seller. I am a title guy, not a plumber or a health professional, so everything below points back to Denver Water's own pages. Where I am giving you my own habit instead of their rule, I will say so.

What Denver Water Says About Lead Service Lines

The service line is the pipe between the water main under the street and the house. According to Denver Water, the water it delivers is lead-free. The concern is lead in customer-owned service lines and in household plumbing, mostly in older homes.

Here is what is on the record, with the source for each:

The estimate: Denver Water's lead page says roughly 60,000 to 64,000 homes in its service area may have a lead service line. Earlier coverage put it as high as 84,000 lines, so treat the number as a moving estimate, not a fixed count.
Home age: Denver Water says homes built before 1951 are the most likely to have one.
Who owns it: Per Denver Water's lead FAQ, the service line is owned by the property owner and installed at their expense.
The program: Denver Water's Lead Reduction Program replaces customer-owned lead lines with copper at no direct charge to the customer, neighborhood by neighborhood, over 15 years. The EPA and the Colorado Department of Public Health and Environment approved the plan in December 2019.
Early pace: Fresh Water News reported in January 2021 that about 4,500 lead lines were replaced in the first year, slightly ahead of the 4,477 goal (read the report).
The outlook: Denver Water publishes where replacements will happen from 2026 to 2031, organized by neighborhood and year. Later years focus on harder areas, including properties along major roads and arterials.
The notice: When a property is selected, Denver Water sends information about the process. That notice typically comes a month or two before the planned replacement.

How to Check Any Address in Two Minutes

This is the process I would run before showing an older home or taking a pre-1951 listing:

Pull the year built. Use the MLS or the county record. Before 1951 is where the lookup matters most, but you can check any address.
Go to the lead page. Open denverwater.org/lead and click "Search by Address." Denver Water notes that on a phone the map may work better if you shrink the screen or turn it to landscape.
Enter the property address. The map tells you whether the home is one of the estimated 60,000 to 64,000 with a possible lead service line.
Save a screenshot. This one is my habit, not a Denver Water rule. Capture the address and the result, then drop it in the transaction folder so you can show what you checked and when.
Call if you are unsure. Denver Water Customer Care is at 303-893-2444, 7:30 a.m. to 5:30 p.m., Monday through Friday, or lead@denverwater.org.
If the map does not recognize the address, it may sit outside Denver Water's service area. Several Front Range cities run their own water systems, so ask that utility the same question.

That is the whole check. The part that takes judgment is knowing what the answer means.

What the Result Does and Does Not Tell You

Denver Water builds its inventory from property records, water quality tests, and visual inspections. That makes the map a good first screen. It does not make it an inspection. A few details from Denver Water's FAQ are worth knowing before you say anything out loud:

A glance at the meter proves little. Service lines can be made of more than one material.
A new water main is not an answer. Denver Water states that a water main replacement does not guarantee the service line is not lead.
Copper does not end the question. Lead-containing fixtures and household plumbing can still raise lead levels in the water.
Confirming a clean line can take investigation. Denver Water may still need to look at the line before it can say no section contains lead.
Remodel records help. Documentation from a remodel that touches the service line can help Denver Water's investigation, so ask the seller for it.

My rule: say what the tool says and where it came from. "The Denver Water map shows this address as a possible lead service line" is accurate. "This house has lead pipes" and "this house is fine" are both claims you cannot back up from a map.

The Free Resources Most Agents Do Not Know About

If an address comes back flagged, the next question from the buyer is usually "so what do I do?" Denver Water has answers, and several are free:

Pitcher and filters: Customers with a known, possible, or suspected lead line can get a water pitcher, filter, and replacement filters at no direct charge. Replacement filters are mailed about every six months, and the filters are certified to NSF Standard 53 for lead. Tenants in enrolled properties get them too.
Water testing: Denver Water offers free lead tests. Per its FAQ, a result under 1 microgram per liter means it is unlikely the service line or internal plumbing contains lead. A result at or above 1 means they may.
Free replacement: Lines in the program are replaced at no direct charge when the neighborhood comes up on the schedule.
Owner-initiated replacement: Owners who replace the line on their own may be eligible for partial reimbursement, and Denver Water asks them to fill out a pre-approval form. The FAQ has listed a one-time $3,800 payment, but the replacement page only says "partial reimbursement" with no amount, so confirm the current figure with Denver Water before you quote it.
Permits and materials: A private replacement uses continuous Type K copper from the main to the indoor shutoff. Denver Water's replacement page says the contractor needs permits from Denver Water and the local permitting office, and has to schedule the tap cut at the main.

On cost, Denver Water's own figure in that 2021 coverage was $5,000 to $10,000 per line. If a buyer asks what a replacement could run, give them that number with the date attached and send them to a licensed plumber for a real quote. Prices move, and a 2021 figure is not a 2026 bid.

How I Would Use This With Buyers and Sellers

With a buyer looking at an older home

Run the address before the showing, not after the inspection objection deadline is already ticking. Then keep it factual. Something like:

"I checked this address on Denver Water's lead service line map and saved the screenshot. It shows [the result]. That map is an estimate, so if you want to know more, Denver Water offers a free water test kit, and your inspector or a plumber can look at the line itself."

Notice what that script does not do. It does not diagnose anything, it does not downplay anything, and it does not tell the buyer what to decide. It hands them the tool and the next step.

With a seller of a pre-1951 home

Check the address before you list. If it is flagged, you can start collecting remodel and plumbing records and look at whether the neighborhood shows up in Denver Water's 2026 to 2031 replacement outlook. A seller who has the paperwork ready is in a better spot than one who first hears about it from a buyer.

One caution. What a seller has to disclose once they know something, or once they run a test, is a legal question. That is one for your managing broker or an attorney, not for me.

This is not the lead-based paint disclosure

If your clients are mixing the two up, here is the difference. The federal lead-based paint disclosure applies to homes built before 1978 and is about paint, and the EPA explains it here. A lead service line is a separate question about the water pipe. A 1965 home could have paperwork on paint and still have nothing on the water line, so do not treat one as covering the other.

Where the Federal Rule Fits

The EPA's Lead and Copper Rule Improvements page says the rule requires water systems to identify and replace lead pipes within 10 years. Denver Water's own program is built on a 15-year schedule from its 2019 approval.

I did not verify how the federal timeline and Denver Water's schedule line up today, and rules like this get revised. If a client asks you about deadlines, do not guess. Point them to Denver Water's lead page and let the utility answer.

A Habit Worth Adding to Your Process

As an Account Executive with Chicago Title of Colorado, I work with Denver Metro agents every day on the things that surprise a deal after contract: dates, documents, and property questions nobody saw coming. A lead line lookup is the same kind of habit as pulling the HOA documents early (the HOA document deadline post) or knowing exactly what the contract says about radon (the Colorado radon disclosure breakdown).

It also pairs with the other condition questions older Denver homes bring up. Insurance is one (Colorado homeowners insurance is now a deal risk), and metro district disclosure is another (what Denver agents owe buyers on metro districts).

If you farm an area with a lot of older homes, a short note to owners of homes built before 1951 with the Denver Water link is a useful touch, and it costs you nothing. Filter by home age, never by neighborhood reputation. Denver Water already notifies customers directly, so you are just making sure the owner has seen it. If you want help building the farm side, my post on neighborhood pages that rank in Denver is a good place to start.

Frequently Asked Questions

How do I find out if a Denver home has a lead service line?

Go to denverwater.org/lead and use the "Search by Address" map. It shows whether the address is one of the estimated 60,000 to 64,000 homes with a possible lead service line. If the result is unclear, call Denver Water Customer Care at 303-893-2444.

Does Denver Water replace lead service lines for free?

Denver Water says its Lead Reduction Program replaces customer-owned lead lines with copper at no direct charge to the customer. Replacements are scheduled neighborhood by neighborhood, so a home may wait for its turn.

Who pays if a buyer wants the line replaced before the program reaches the neighborhood?

Denver Water says the service line belongs to the property owner. Owners who replace it on their own may be eligible for partial reimbursement after a pre-approval form. Who pays in a given deal is a negotiation between the parties, so talk to your broker.

Does a new water main mean the home has no lead line?

No. Denver Water states that a water main replacement does not guarantee the service line is not made of lead. The service line is a separate pipe from the main.

Is a lead service line the same as lead-based paint?

No. Lead-based paint disclosure is a federal rule for homes built before 1978 and covers paint. A lead service line is the water pipe between the main and the house, and it is a separate question.

Keep This One Handy

Bookmark the Denver Water lead page, and save the Customer Care number in your phone. The next time a buyer asks about the pipe under the lawn, you will have an answer in two minutes and a screenshot to back it up.

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