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Review government records associated with South El Monte, California.
Toxin Scout is in beta. Please verify important findings with the linked sources.
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Use EPA’s site search to locate the underlying cleanup record, then review its boundaries, affected environmental media, investigation dates and latest status. A nearby site listing does not establish exposure at an address. Groundwater or surface water findings also do not establish tap water results; those require information about the actual drinking water supply.
Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for South El Monte, CA from EPA SDWIS.
Downey - City, Water Dept.
Active health-based drinking-water issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 110,556 people
Monterey Park-City, Water Dept.
Active health-based drinking-water issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 62,183 people
Liberty Utilities (Av Ranchos) Corp.
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 64,469 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Sep 2024 to Jul 2025.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
20 PFAS sample results above EPA limits
Sample period: Jan 2025 to Jul 2025
UCMR5 results are sampled by public water system, not every household. Confirm your water provider before treating these as tap-water results for a specific address.
| Chemical | Concentration (µg/L) | EPA Limit (µg/L) | Sample date | Over Limit |
|---|---|---|---|---|
| PFOS | 0.0440 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0380 | 0.0040 | 2025-01-14 | Yes |
| PFOS | 0.0330 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0320 | 0.0040 | 2025-01-14 | Yes |
| PFOS | 0.0290 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0270 | 0.0040 | 2025-01-14 | Yes |
| PFOS | 0.0190 | 0.0040 | 2025-07-01 | Yes |
| PFOA | 0.0150 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0140 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0140 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0130 | 0.0040 | 2025-07-01 | Yes |
| PFOS | 0.0120 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0120 | 0.0040 | 2025-07-01 | Yes |
| PFOA | 0.0120 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0110 | 0.0040 | 2025-07-01 | Yes |
| PFOA | 0.0110 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0100 | 0.0040 | 2025-07-01 | Yes |
| PFOA | 0.0100 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0086 | 0.0040 | 2025-01-14 | Yes |
| PFOA | 0.0083 | 0.0040 | 2025-01-14 | Yes |
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not South El Monte drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
EPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Alhambra Wash-Rio Hondo
Reported: Nov 2026
Health-relevant causes: Mercury, Metals (other Than Mercury), Pathogens
Affected uses: Ecological, Fishconsumption, Other, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Data from EPA ECHO
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Los Angeles County
Assessment year: 2020
According to EPA, a cancer risk of 40-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 40 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
EPA designations apply to a specific pollutant and federal air quality standard (NAAQS). EPA can issue a clean-data determination while a formal designation remains in effect.
Los Angeles-South Coast Air Basin: Ozone
NonattainmentExtreme8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Los Angeles-South Coast Air Basin: PM2.5
NonattainmentSeriousPM-2.5 (2012 Standard)
Original designation: Apr 2015
Health effects (EPA): Cardiovascular disease, respiratory illness, premature death (EPA)
Los Angeles County-South Coast Air Basin: Lead
NonattainmentLead (2008 Standard)
Original designation: Dec 2010
Health effects (EPA): Neurological damage, kidney damage, developmental effects in children (EPA)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Anaheim
Annual mean: 0.3 Parts per million
Observation year: 2025
Annual mean: 19.0 Parts per billion
Observation year: 2025
Annual mean: 0.038 Parts per million
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
M. Argueso & Co. Inc.
Reported: 2024
Miller Castings Inc.
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 2026
State environmental agencies maintain cleanup site databases that include state Superfund, voluntary cleanup, and brownfield remediation programs. These programs track additional sites beyond those on the federal NPL.
3 sites with active cleanup or investigation
1734 Tyler Avenue, South El Monte
0.5 miles away · LOS ANGELES County
Reported: Nov 2026
Covers all of city of South El Monte and portions of El Monte and Rosemead, South El Monte
0.4 miles away · LOS ANGELES County
Reported: Nov 2026
1829 Tyler Avenue, South El Monte
0.5 miles away · LOS ANGELES County
Reported: Nov 2026
Data from EPA ECHO
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Toxics Release Inventory data — chemicals disposed on-site at reporting facilities.
M. Argueso & Co. Inc.
Open data source: View EPA TRI facility recordNo MSHA mine or extraction site records shown for this report.
Los Angeles County, CA
EPA Radon Zone Map (June 2024 release)
Los Angeles County is EPA Radon Zone 2 (moderate potential). EPA defines Zone 2 counties as having predicted average indoor screening levels between 2 pCi/L and 4 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
No FEMA flood-zone records shown for this report.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
No records dated within the last 5 years surfaced for this city report.
Reviewed: last 5 years
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Los Angeles County, CaliforniaPop. 9,721,138
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 6,317 | 6,373 | 7,972 |
| Poor or Fair Health | 18.2% | 15.8% | 14.2% |
| Poor Physical Health Days | 3.5 | 3.1 | 3.3 |
| Poor Mental Health Days | 5.1 | 4.7 | 4.8 |
| Adult Smoking | 11.0% | 8.8% | 15.0% |
| Adult Obesity | 28.5% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 13.4 | 7.1 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 11.7% | 10.8% | 9.6% |
| Life Expectancy | 80.1 | 79.9 | 77.6 |
EPA testing found PFAS in water samples from Downey-City, Water Department. Results dated Jan 14, 2025 to Jul 1, 2025 include PFOS at 0.012 to 0.044 micrograms per liter and PFPeA at 0.0062 to 0.027 micrograms per liter.
EPA testing found PFAS in water samples from Monterey Park-City, Water Department. Results dated Sep 16, 2024 to Mar 14, 2025 include PFBA at 0.0072 to 0.0074 micrograms per liter and PFPeA at 0.005 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 2 violations for Downey-City, Water Department.
EPA drinking water records on this page list 2 violations for Monterey Park-City, Water Department, including 2 marked active.
EPA drinking water records on this page list 1 violation for Liberty Utilities (Av Ranchos) Corp..
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for South El Monte.
The monitoring station at Anaheim recorded an annual average of 0.3 Parts per million for carbon monoxide in 2025.
The monitoring station at Anaheim recorded an annual average of 19 Parts per billion for nitrogen dioxide in 2025.
The monitoring station at Anaheim recorded an annual average of 0.038 Parts per million for ozone in 2025.
Download 2025 EPA annual monitor dataCurrent air quality on AirNow
The radon data for South El Monte covers Los Angeles County. EPA places this area in Zone 2, with a predicted average indoor radon screening level of 2 to 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for South El Monte reports a life expectancy of 80.1 years in Los Angeles County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for South El Monte reports 6,317 years of life lost to deaths before age 75 per 100,000 residents in Los Angeles County, California. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for South El Monte lists fine-particle pollution (PM2.5) at 13.4 micrograms per cubic meter in Los Angeles County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
Federal pipeline records list an incident involving Southern California Gas Co near South El Monte on May 8, 2015. The reported release was natural gas.