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Mcclellan Air Force Base (Ground Water Contamination)

This site is currently on the EPA Superfund National Priorities List and remains under federal cleanup oversight. Most-cited contaminant of concern: Arsenic.

Approx 5200 Watt Ave, McClellan Park, California · ZIP 95652 · EPA ID CA4570024337

See Sacramento ContaminantsEquity contextHow we read Superfund data
CLEANUP TIMELINE

Listing-date and cleanup-phase enrichment from EPA's per-site SEMS profile is queued for a follow-up ingest pass. Until then, this section will populate from EPA's published timeline data.

Anomaly engine

Notable Signals

No notable signals at this Superfund site for the current ingest. Cleanup-phase and SEMS-action flags are deferred to a follow-up engineering pass.

Contaminants of concern · per EPA SEMS

What's In This Site

Each row pairs a contaminant with the medium it was found in (the exposure pathway). Hover any named contaminant for an agency-cited health-risk summary. Cited count = number of SEMS decision records (RODs and related) that name the pair.

ContaminantPathwayCited
ArsenicHealth riskIARC Group 1 carcinogen via inhalation and ingestion. EPA MCL 10 µg/L; chronic exposure causes skin, lung, bladder cancer and cardiovascular disease. (IARC, EPA, ATSDR)Soil12
Benzo[A]PyreneHealth riskPAH; IARC Group 1 carcinogen; the prototypical PAH used to benchmark PAH-mixture cancer risk. EPA MCL 0.2 µg/L. (IARC, EPA)Soil11
LeadHealth riskNeurotoxin. Even low childhood exposure impairs cognitive development; chronic adult exposure damages kidneys and the cardiovascular system. (EPA, ATSDR)Soil10
Benzo[A]AnthraceneHealth riskPAH; IARC Group 2B possible carcinogen; common combustion byproduct and creosote constituent. (IARC)Soil9
CadmiumSoil9
ChryseneSoil9
Indeno(1,2,3-Cd)PyreneSoil9
NaphthaleneHealth riskIARC Group 2B possible carcinogen; causes hemolytic anemia, especially in infants. (IARC)Soil9
Benzo(B)FluorantheneSoil8
Benzo(K)FluorantheneSoil8
CopperHealth riskInhaled copper fumes cause metal-fume fever; chronic ingestion above EPA's 1.3 mg/L action level damages the liver. (EPA)Soil8
Dibenzo(A,H)AnthraceneSoil8
Total Petroleum Hydrocarbon -DieselSoil8
ZincHealth riskGenerally low acute toxicity. Chronic high-dose exposure disrupts copper absorption and immune function. (ATSDR)Soil8
Aroclor 1260Health riskPCBs. IARC Group 1 carcinogen; immune, reproductive, and neurological effects; bioaccumulate in fish and breast milk. Banned in 1979; persist as legacy contamination. (IARC, EPA)Soil7
CobaltSoil7
NaphthaleneHealth riskIARC Group 2B possible carcinogen; causes hemolytic anemia, especially in infants. (IARC)Soil Gas7
Total Petroleum Hydrocarbon -GasolineSoil7
1,4-DichlorobenzeneHealth riskIARC Group 2B possible carcinogen; common in mothballs and air fresheners. EPA MCL 75 µg/L. (IARC, EPA)Soil6
BenzeneHealth riskIARC Group 1 carcinogen. Long-term inhalation causes leukemia and bone-marrow disorders. (IARC, EPA)Soil Gas6
ChloroformSoil Gas6
DieldrinHealth riskIARC Group 3 (inadequate evidence) but EPA classifies as 'probable human carcinogen'; neurotoxin and persistent organic pollutant. (EPA, ATSDR)Soil6
Polychlorinated Biphenyls (Pcbs)Health riskPCBs. IARC Group 1 carcinogen; immune, reproductive, and neurological effects; bioaccumulate in fish and breast milk. Banned in 1979; persist as legacy contamination. (IARC, EPA)Soil6
TetrachloroetheneHealth riskPCE / 'perc'. IARC Group 2A probable carcinogen; central-nervous-system effects; common dry-cleaning solvent and DNAPL plume contaminant. EPA MCL 5 µg/L. (IARC, EPA)Soil Gas6
ThalliumSoil6
TrichloroetheneHealth riskTCE. IARC Group 1 carcinogen — kidney cancer; suspected liver cancer and non-Hodgkin lymphoma. EPA MCL 5 µg/L; common DNAPL groundwater plume contaminant. (IARC, EPA, ATSDR)Soil Gas6
1,2,4-TrimethylbenzeneHealth riskEye, skin, and respiratory irritant; high exposure causes nervous-system effects. (ATSDR)Soil Gas5
1,3,5-TrimethylbenzeneSoil Gas5
1,4-DichlorobenzeneHealth riskIARC Group 2B possible carcinogen; common in mothballs and air fresheners. EPA MCL 75 µg/L. (IARC, EPA)Soil Gas5
2-MethylnaphthaleneSoil5

Showing the top 30 pairs by SEMS citation count. 297 additional (contaminant, pathway) pairs are recorded for this site.

Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 3 systems below draw on groundwater (or mixed sources) and serve communities whose centroid sits within 3 miles of this site. Distance is to the served-city centroid — SDWIS does not expose individual wellhead locations, so this is a proximity screen, not a wellhead-impact assessment.

Water systemServesDistancePopulation servedSourceStatus
Mc Clellan Mhp PrivateNorth Highlands1.7 mi700GROUNDWATERUNRESOLVED
Eleven Oaks Mobile Home Community PrivateNorth Highlands1.7 mi262GROUNDWATERUNRESOLVED
Rio Linda/Elverta Community Water Dist MunicipalRio Linda3.0 mi15,460GROUNDWATERIn compliance

Methodology: served-city centroid (TIGER 2020) is used as the PWS coordinate. Source-water classification from SDWIS primary_source_code; only groundwater and mixed-source systems are queried. Click any system above for its full SDWIS profile.

Equity context · ACS 2018-2022 block-group demographics

Who Lives Near This Site

Within 1 mile of this site (1 Census block groups, population-weighted demographics): a population of 1,193. Why we surface this →

POPULATION SHARE
80.6%

Low-income

POPULATION SHARE
71.0%

People of color

POPULATION SHARE
6.0%

Under age 5

POPULATION SHARE
2.3%

Over age 64

Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 1-mile buffer around this site (from USEPA-clone/EJAM-open blockgroupstats). NPL site proximity contributes to the national EJ pattern; indicator-level percentile and disparity scores are surfaced on the county page and the state page.

Source. EPA Superfund Enterprise Management System (SEMS) · retrieved 2026-05-07. SEMS is a federal public-domain dataset under 17 USC §105.

What this is not. We report EPA's published Superfund record — site listing, status, and contaminants of concern as named in EPA's decision documents. We do not perform site visits, independent air or water sampling, or current-state health-risk assessment. NPL listing reflects EPA's Hazard Ranking Score at a point in time; it does not by itself describe present-day exposure.