Lead Pipe Map

Colorado · population 99,818

Lead pipes in Longmont, CO

No lead lines reported

Most of Longmont (population 99,818) gets its water from City of Longmont, which reported 30,821 service lines and no lead, galvanized or unknown lines.

0% of City of Longmont's service lines are lead or galvanized requiring replacement, lower than the Colorado average (1.2%) and lower than the national average (3.1%).

0Lead
0Galvanized, replace
0Unknown material
30,821Non-lead

Latest lead test for City of Longmont (Jan 2023–Dec 2025): 1.6 ppb at the 90th percentile, against a 15 ppb federal action level. Full test history.

Compliance record: EPA lists no Lead and Copper Rule violations since 2015 for City of Longmont.

Water systems serving Longmont

Water systemLeadGalv.Unknown% lead
City of LongmontMain system0000%
Left Hand WDServes nearby areas0000%

Matched from EPA water system service area boundaries and the cities each system reports serving. Edges of the city may be served by a neighboring system; your water bill names your utility.

Check your address in Longmont

The counts above cover the whole water system. To see whether your line is lead, look up your address on City of Longmont's official inventory. Utilities had to make these public by October 16, 2024.

Find the official inventory mapCity of Longmont details

No map yet? Do the 2-minute scratch and magnet test.

Protect your drinking water

If your line is lead, galvanized or unknown, use a filter certified to NSF/ANSI 53 for lead for drinking, cooking and baby formula, and use only cold water.

Pitcher filtersCheapest start. Pick one certified to NSF/ANSI 53 for lead, such as Brita Elite, PUR Plus or ZeroWater.See pitchers Faucet-mount filtersFilters straight from the tap. Look for NSF/ANSI 53 lead reduction on the box.See faucet filters Under-sink systemsBest for families. Carbon block (NSF 53) or reverse osmosis (NSF 58) units rated for lead.See under-sink

Choosing a lead-certified filter · Testing your water · Replacement cost

Nearby cities

Check another water system

Questions

Does Longmont, CO have lead pipes?

City of Longmont, which serves Longmont, reported no lead, galvanized or unknown service lines.

Who supplies water to Longmont?

EPA's service area maps place most of Longmont in City of Longmont's service area (PWSID CO0107485). Left Hand WD also serves parts of the city or nearby areas.

How do I check whether my Longmont home has a lead service line?

Search your address on City of Longmont's service line inventory map. You can also scratch the pipe where water enters your home: lead is soft, dull gray, scratches to shiny silver and doesn't attract a magnet.

When will lead pipes in Longmont be replaced?

EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask City of Longmont whether your street is scheduled and whether it covers the private side.