Loading city report
Preparing Leon Valley environmental records...
Review government records associated with Leon Valley, Texas.
Toxin Scout is in beta. Please verify important findings with the linked sources.
Loading city report
Preparing Leon Valley environmental records...
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 Leon Valley, TX from EPA SDWIS.
City of Leon Valley
Active monitoring or reporting issue detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 7,794 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 Aug 2024.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Leon Valley 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.
Middle Leon Creek
Reported: Nov 2026
Health-relevant causes: Pathogens, Per- And Polyfluoroalkyl Substances (pfas), Polychlorinated Biphenyls (pcbs)
Affected uses: Fishconsumption, 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.
Bexar County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 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 designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
San Antonio: Ozone
NonattainmentSerious8-Hour Ozone (2015 Standard)
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Calaveras Lake — San Antonio, Texas
Annual mean: 0.3 Parts per billion
Observation year: 2025
Annual mean: 11.1 Parts per billion
Observation year: 2025
Annual mean: 0.041 Parts per million
EPA primary exceedance count: 3 (Ozone 8-hour 2015)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
No facility records with active violation or noncompliance flags surfaced in EPA ECHO.
Reviewed: active/open records as of Q4 2025
Data from EPA ECHO
Reviewed: source records as of 2024
EPA records for current, proposed and formerly listed Superfund sites on the National Priorities List (NPL).
Open data source: Search EPA ECHOEPA FRS Registry ID 110020125620
Reported: Nov 2021
Reviewed: source query run Nov 2026
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.
Napco Precast LLC
Open data source: View EPA TRI facility recordNo MSHA mine or extraction site records shown for this report.
Bexar County, TX
EPA Radon Zone Map (June 2024 release)
Bexar County is EPA Radon Zone 3 (low potential). EPA defines Zone 3 counties as having predicted average indoor screening levels below 2 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.
Special Flood Hazard Area — 1% annual chance of flooding (100-year floodplain) with base flood elevation.
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.
Bexar County, TexasPop. 2,059,530
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 | 8,349 | 7,875 | 7,972 |
| Poor or Fair Health | 21.0% | 17.9% | 14.2% |
| Poor Physical Health Days | 4.0 | 3.3 | 3.3 |
| Poor Mental Health Days | 5.3 | 4.6 | 4.8 |
| Adult Smoking | 13.2% | 13.3% | 15.0% |
| Adult Obesity | 38.8% | 36.2% | 34.0% |
| Air Pollution - Particulate Matter | 9.1 | 8.6 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 12.7% | 11.0% | 9.6% |
| Life Expectancy | 76.7 | 77.2 | 77.6 |
EPA testing found PFAS in water samples from the City of Leon Valley. Results dated Aug 13, 2024 include PFBS at 0.0031 micrograms per liter.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 67 violations for the City of Leon Valley.
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 Leon Valley.
The monitoring station at Calaveras Lake, San Antonio, Texas recorded an annual average of 0.3 Parts per billion for sulfur dioxide in 2025.
The monitoring station at Calaveras Lake, San Antonio, Texas recorded an annual average of 11.1 Parts per billion for nitrogen dioxide in 2025.
The monitoring station at Calaveras Lake, San Antonio, Texas recorded an annual average of 0.041 Parts per million for ozone in 2025.
The radon data for Leon Valley covers Bexar County. EPA places this area in Zone 3, with a predicted average indoor radon screening level below 2 picocuries per liter.
This city report shows 1 Superfund site: Bandera Road Ground Water Plume.
No brownfield sites were returned for this city report.
The county data for Leon Valley reports a life expectancy of 76.7 years in Bexar County, Texas.
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 Leon Valley reports 8,349 years of life lost to deaths before age 75 per 100,000 residents in Bexar County, Texas. 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 Leon Valley lists fine-particle pollution (PM2.5) at 9.1 micrograms per cubic meter in Bexar County, Texas.
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 Cps Energy near Leon Valley on Sep 16, 2012.