Lead Pipe Map

California · population 33,226

Lead pipes in San Dimas, CA

No lead lines reported

Most of San Dimas (population 33,226) gets its water from Gswc-San Dimas, which reported 16,303 service lines and no lead, galvanized or unknown lines.

0% of Gswc-San Dimas'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
0Unknown material
16,303Non-lead

Latest lead test for Gswc-San Dimas (Jan 2026–Jun 2026): 1.2 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 Gswc-San Dimas.

Water systems serving San Dimas

Water systemLeadGalv.Unknown% lead
Gswc-San DimasMain system0000%

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 San Dimas

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

Find the official inventory mapGswc-San Dimas 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 San Dimas, CA have lead pipes?

Gswc-San Dimas, which serves San Dimas, reported no lead, galvanized or unknown service lines.

Who supplies water to San Dimas?

EPA's service area maps place most of San Dimas in Gswc-San Dimas's service area (PWSID CA1910142).

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

Search your address on Gswc-San Dimas'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 San Dimas 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 Gswc-San Dimas whether your street is scheduled and whether it covers the private side.