Lead pipes · ZIP 20815
Lead pipes in Chevy Chase, MD
ZIP 20815 (Maryland) — lead pipes summary sourced from EPA LCRR + RTI National Lead Pipe Map. Data lands this week as the EPA LCRR + RTI National Lead Pipe Map ingestion pipeline rolls out.
Last verified 2026-04-24 · methodology
What lands here
Pages show the utility's reported count of lead, galvanized-requiring-replacement, and unknown-material lines, plus the state's reporting compliance status.
Source & refresh
EPA LCRR + RTI National Lead Pipe Map. Refreshed quarterly as state primacy agencies report. Stale data is flagged, never silently served. Primary source →
Limitations specific to this source
Coverage rolls out state-by-state through 2026-2027 per the federal timeline. Utilities with incomplete inventories are flagged rather than omitted.
Maryland context
Chesapeake flood, lead pipes
Maryland has dense FEMA NFHL coverage along Chesapeake Bay tributaries. Baltimore City has extensive LCRR lead-service-line obligations and flagged EPA SDWIS compliance history. Radon Zone 1-2 across most counties.
See Maryland state page for the full state-level rollup across all 12 dimensions.
Read more on lead pipes
Editorial deep-dives explaining the source data, its limits, and how to read it.
EPA Radon Zones — what 1, 2, and 3 mean and when you should test
EPA classifies every US county into Zone 1 (high), Zone 2 (moderate), or Zone 3 (low) for radon. Plain-English guide to the classifications and at-home testing.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
EPA SDWIS — how to read drinking-water violations and what they actually mean
Plain-English guide to EPA SDWIS drinking-water violations: health-based vs. monitoring vs. reporting violations, MCLs, and what triggers a public notice.
Radon and real estate — what disclosure laws and home tests actually require
What home sellers must disclose about radon by state, when home tests are required, and how to interpret radon-mitigation systems if a home you're buying has one.
Full dashboard for ZIP 20815
Lead pipes is one of twelve dimensions zipradar federates per address. See the full federated summary for ZIP 20815:
Open Chevy Chase, MD dashboard →