Lead Pipe Map

Montgomery County, MD · PWSID MD0150005

Washington Suburban Sanitary Commission lead service lines

1,285 lead or galvanized lines to replace

Washington Suburban Sanitary Commission reported 8 lead and 1,277 galvanized-requiring-replacement service lines out of 519,915 in its inventory. That's about 1 in 405 lines. Another 57,121 (11%) are still listed as unknown material.

Ranks #1 of 37 Maryland systems with confirmed lead lines, and #327 nationally.

0.2% of Washington Suburban Sanitary Commission's service lines are lead or galvanized requiring replacement. That's higher than the Maryland average (0.2%) and lower than the national average (3.1%).

8Lead
1,277Galvanized, replace
57,121Unknown material
461,509Non-lead

Total service lines reported: 519,915. Reported all required service line types. Population served: 1,900,000; 438,639 connections.

Lead test results

Washington Suburban Sanitary Commission's most recent 90th-percentile lead result (Jan 2018–Dec 2020) was not detected, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.

1510Jan 2015–Dec 2017: 1.1 ppb2015Jan 2018–Dec 2020: not detected2018

Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.

Progress since 2025 Q1

Reported lead and galvanized-requiring-replacement lines went from 1,285 in 2025 Q1 to 1,285 in 2026 Q3: no change. Lines of unknown material went from 57,121 to 57,121, no change.

2025 Q1: 1,285 lead + galvanized1,2852025 Q12025 Q2: 1,285 lead + galvanized1,2852025 Q22025 Q3: 1,285 lead + galvanized1,2852025 Q32025 Q4: 1,285 lead + galvanized1,2852025 Q42026 Q1: 1,285 lead + galvanized1,2852026 Q12026 Q2: 1,285 lead + galvanized1,2852026 Q22026 Q3: 1,285 lead + galvanized1,2852026 Q3

Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.

Lead rule violations

EPA's data lists no Lead and Copper Rule violations for Washington Suburban Sanitary Commission since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.

Source: EPA SDWIS violation records for the Lead and Copper Rule.

Where the water comes from

Washington Suburban Sanitary Commission's main water source is surface water (rivers, lakes or reservoirs). It sells water to 6 other water systems: Waldorf - Charles County DPW, Howard County D.P.W. Distribution, City of Rockville, Fairland Crossing Apartments, Whitley Park Condominiums, Columbia Towers.

Source: EPA SDWIS water system and facility records.

Check your own address

These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.

Find the official inventory map

No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.

Protect your drinking water now

If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.

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

How to pick a lead-certified filter · How to test your water for lead

Getting the line replaced

EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Washington Suburban Sanitary Commission whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.

County pages: Lead pipes in Montgomery County

Cities served

ZIP codes served

ZIP codes whose center falls inside Washington Suburban Sanitary Commission's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.

206072070520706207072070820710207122072020721207222073520737207402074220743207442074520746207472074820762207692077020771207742078120782207832078420785208142081520816208172081820832208522085320854208552086020861208662086820872208762087720878208792088020886208892089220894208952089620899209012090220903

Other water systems nearby

SystemLead + galv.Unknown
City of Rockville08,298
Town of Poolesville091
Fairland Crossing Apartments00

Check another water system

Questions

Does Washington Suburban Sanitary Commission have lead pipes?

Yes. Washington Suburban Sanitary Commission reported 8 lead service lines and 1,277 galvanized lines that must be replaced, out of 519,915 total. 57,121 more are of unknown material.

How do I check if my home's service line is lead?

Look up your address on Washington Suburban Sanitary Commission's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.

When will Washington Suburban Sanitary Commission replace lead service lines?

Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.

Has Washington Suburban Sanitary Commission had lead violations?

EPA's data shows no Lead and Copper Rule violations since 2015 for Washington Suburban Sanitary Commission.

Which water filters remove lead?

Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.

Embed or cite this data

Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.

Citation: Lead Pipe Map, "Washington Suburban Sanitary Commission lead service lines," https://leadpipemap.com/md/washington-suburban-sanitary-commission/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.