Lead Pipe Map

Washington · population 6,787

Lead pipes in Black Diamond, WA

282 lines still unidentified

Most of Black Diamond (population 6,787) gets its water from Black Diamond Water Dept. It reported no confirmed lead service lines, but 282 of 2,131 lines are still listed as unknown material, so lead hasn't been ruled out.

0% of Black Diamond Water Dept's service lines are lead or galvanized requiring replacement, lower than the Washington average (0.3%) and lower than the national average (3.1%).

0Lead
0Galvanized, replace
282Unknown material
1,849Non-lead

Latest lead test for Black Diamond Water Dept (Jan 2023–Dec 2025): 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 Black Diamond Water Dept.

Water systems serving Black Diamond

Water systemLeadGalv.Unknown% lead
Black Diamond Water DeptMain system002820%
Covington Water DistrictServes nearby areas002420%

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 Black Diamond

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

Find the official inventory mapBlack Diamond Water Dept 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 Black Diamond, WA have lead pipes?

None are confirmed, but Black Diamond Water Dept still lists 282 service lines as unknown material.

Who supplies water to Black Diamond?

EPA's service area maps place most of Black Diamond in Black Diamond Water Dept's service area (PWSID WA5307220). Covington Water District also serves parts of the city or nearby areas.

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

Search your address on Black Diamond Water Dept'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 Black Diamond 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 Black Diamond Water Dept whether your street is scheduled and whether it covers the private side.