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Superfund / NPL site · EPA Superfund SEMS through latest publishNPL Final

Casmalia Resources

This site is currently on the EPA Superfund National Priorities List and remains under federal cleanup oversight. Most-cited contaminant of concern: (Z)-1,3-Dichloro-1-Propene.

3300 Ntu Road, Casmalia, California · ZIP 93429 · EPA ID CAD020748125

See Santa Barbara 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
(Z)-1,3-Dichloro-1-PropeneGroundwater1
1,1,1-TrichloroethaneHealth riskMethyl chloroform. CNS depressant; ozone-depleting substance phased out under Montreal Protocol. EPA MCL 200 µg/L. (EPA, ATSDR)Groundwater1
1,1,2,2-TetrachloroethaneGroundwater1
1,1,2-Trichloro-1,2,2-TrifluoroethaneGroundwater1
1,1,2-TrichloroethaneGroundwater1
1,1-DichloroethaneHealth riskSuspected carcinogen (EPA C/likely); CNS depressant. Common at solvent-contaminated sites as a degradation intermediate. (EPA, ATSDR)Groundwater1
1,1-DichloroetheneHealth riskVinylidene chloride; IARC Group 3 (inadequate evidence in humans) but liver toxic in animal studies; common TCE/PCE biodegradation product. (IARC, EPA)Groundwater1
1,2,3,4,6,7,8,9-Octachlorodibenzo[B,E][1,4]Dioxin (Ocdd)Groundwater1
1,2,3,4,6,7,8,9-OctachlorodibenzofuranGroundwater1
1,2,3,4,6,7,8-Heptachlorodibenzo[B,E][1,4]Dioxin (Hpcdd)Groundwater1
1,2,3,4,6,7,8-HeptachlorodibenzofuranGroundwater1
1,2,3,4,7,8,9-HeptachlorodibenzofuranGroundwater1
1,2,3,4,7,8-Hexachlorodibenzo[B,E][1,4]Dioxin (Hxcdd)Groundwater1
1,2,3,4,7,8-Hexachlorodibenzofuran (Hxcdf)Groundwater1
1,2,3,6,7,8-Hexachlorodibenzo[B,E][1,4]Dioxin (Hxcdd)Groundwater1
1,2,3,6,7,8-Hexachlorodibenzofuran (Hxcdf)Groundwater1
1,2,3,7,8,9-Hexachlorodibenzo-P-Dioxin (Hxcdd)Groundwater1
1,2,3,7,8,9-Hexachlorodibenzofuran (Hxcdf)Groundwater1
1,2,3,7,8-Pentachlorodibenzo[B,E][1,4]Dioxin (Pecdd)Groundwater1
1,2,3,7,8-PentachlorodibenzofuranGroundwater1
1,2-DichloroethaneHealth riskIARC Group 2B possible carcinogen; liver and kidney toxic. EPA MCL 5 µg/L. (IARC, EPA)Groundwater1
1,2-DichloropropaneGroundwater1
1,2-Dimethylbenzene (O-Xylene)Groundwater1
1,3-ButadieneSoil Gas1
1,4-DioxaneHealth riskIARC Group 2B possible carcinogen; persistent in groundwater, resists conventional treatment. EPA HRL 0.35 µg/L (10⁻⁶ cancer risk). (IARC, EPA)Groundwater1
2,3,4,6,7,8-HexachlorodibenzofuranGroundwater1
2,3,4,7,8-Pentachlorodibenzofuran (Pecdf)Groundwater1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd)Groundwater1
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Tcdd) Toxicity Equivalents (Teq)Soil1
2-Methoxy-2-Methylpropane (Mtbe)Health riskMTBE. IARC Group 3 (inadequate evidence in humans); EPA classifies as a 'potential human carcinogen'; gasoline oxygenate widely detected in groundwater post-leaking USTs. (IARC, EPA)Groundwater1

Showing the top 30 pairs by SEMS citation count. 84 additional (contaminant, pathway) pairs are recorded for this site.

Drinking-water linkage · SDWIS

Groundwater Systems Serving Communities Within 3 Miles

The 1 system 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
Casmalia Community Services District PrivateCasmalia1.9 mi234GROUNDWATERUNRESOLVED

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

Santa Barbara County, California (no Census block groups within 1 mile and no host city — falling back to containing county): a population of 445,213. Why we surface this →

POPULATION SHARE
13.5%

Low-income

POPULATION SHARE
57.4%

People of color

POPULATION SHARE
5.9%

Under age 5

POPULATION SHARE
15.9%

Over age 64

Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror). 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.