{ "meta": { "title": "How Old Is America's Plumbing? Homes by Year Built, by State and Metro", "generated": "2026-11-04", "source": { "name": "U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates, table B25034 (Year Structure Built)", "url": "https://data.census.gov/table/ACSDT5Y2024.B25034", "via": "https://api.censusreporter.org" }, "universe": "All housing units, occupied and vacant", "groups": { "pre1960": "Built before 1960: the galvanized steel supply pipe and cast iron drain era", "pre1940": "Built 1939 or earlier", "y1960to1979": "Built 1960 to 1979", "y1980to1999": "Built 1980 to 1999: the closest window to the polybutylene era (about 1978-1995)", "pre1970": "Built before 1970 (more than 55 years old)", "since2000": "Built 2000 or later" }, "minMetroUnits": 100000, "license": "CC BY 4.0", "attribution": "HearthDry (2026). How Old Is America's Plumbing? https://hearthdry.com/research/home-plumbing-age-by-state" }, "national": { "name": "United States", "units": 143775360, "medianYearBuilt": 1980, "medianSource": "B25035", "pre1960": { "pct": 25.6, "moe": 0.0, "units": 36857929 }, "pre1940": { "pct": 11.7, "moe": 0.0, "units": 16880456 }, "y1960to1979": { "pct": 24.0, "moe": 0.0, "units": 34530176 }, "y1980to1999": { "pct": 25.3, "moe": 0.0, "units": 36333782 }, "pre1970": { "pct": 35.5, "moe": 0.0, "units": 51028217 }, "since2000": { "pct": 25.1, "moe": 0.0, "units": 36053468 }, "bins": { "2020 or later": 2879269, "2010-2019": 13572327, "2000-2009": 19601872, "1990-1999": 17793864, "1980-1989": 18539918, "1970-1979": 20359888, "1960-1969": 14170288, "1950-1959": 13623433, "1940-1949": 6354040, "1939 or earlier": 16880456 } }, "states": [ { "name": "District of Columbia", "units": 361014, "medianYearBuilt": 1958, "medianSource": "B25035", "pre1960": { "pct": 52.2, "moe": 1.0, "units": 188504 }, "pre1940": 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