Lead Pipe Map

California · population 7,124

Lead pipes in Mammoth Lakes, CA

2,218 lines still unidentified

Most of Mammoth Lakes (population 7,124) gets its water from Mammoth CWD. It reported no confirmed lead service lines, but 2,218 of 3,719 lines are still listed as unknown material, so lead hasn't been ruled out.

0% of Mammoth CWD's service lines are lead or galvanized requiring replacement, lower than the California average (0.1%) and lower than the national average (3.1%).

0Lead
0Galvanized, replace
2,218Unknown material
1,501Non-lead

Latest lead test for Mammoth CWD (Jan 2024–Dec 2026): 1.5 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 Mammoth CWD.

Water systems serving Mammoth Lakes

Water systemLeadGalv.Unknown% lead
Mammoth CWDMain system002,2180%

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 Mammoth Lakes

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

Find the official inventory mapMammoth CWD 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 Mammoth Lakes, CA have lead pipes?

None are confirmed, but Mammoth CWD still lists 2,218 service lines as unknown material.

Who supplies water to Mammoth Lakes?

EPA's service area maps place most of Mammoth Lakes in Mammoth CWD's service area (PWSID CA2610001).

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

Search your address on Mammoth CWD'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 Mammoth Lakes 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 Mammoth CWD whether your street is scheduled and whether it covers the private side.