REG MASON CITY LLC
Parent Company: CHEVRON CORP
4172 19TH ST SW, MASON CITY, Iowa 50401
Pollution Risk
100Based on 23 TRI facilities in zip code 50401
Water Quality
100149 violations recorded
Air Quality
52County-level EPA AQS data for CERRO GORDO
Facility Information
Water Quality in 50401
Total Violations
149
Health Violations
23
Contaminants Found
12
Water Safety Score
100/100
Contaminants Detected:
Should You Be Concerned About REG MASON CITY LLC?
REG MASON CITY LLCis registered in the EPA's Toxic Release Inventory (TRI). This means the facility reports handling, releasing, or transferring toxic chemicals as part of its operations. However, the overall environmental safety score for this area is 86/100 — indicating that despite the presence of this facility, the surrounding environment remains relatively healthy.
Water quality in zip code 50401 is good (100/100), suggesting that despite the TRI facility, drinking water hasn't been significantly impacted.
This zip code has 23 total TRI facilities, which is a high concentration that compounds environmental health risks — each facility contributes pollutants that may interact in ways individual facility data doesn't capture. Areas with multiple TRI sites tend to have higher rates of respiratory issues and environmental sensitivity, according to EPA research.
What you can do: Check your home's water quality with an annual test kit, monitor local air quality alerts, and review the full Iowa pollution report for broader context. CHEVRON CORP operates this facility — check if they have a public environmental responsibility report.
Other TRI Facilities in 50401 (22)
CONTINENTAL GRAIN CO INC WAYNE FEED DIV
1603 S EISENHOWER AVE
CONTINENTAL GRAIN CO
CURRIES DIV OF AADG INC.
1500 12TH ST NW - 1502 12TH ST NW
ASSA ABLOY INC
AADG INC CURRIES DIV 9TH ST FACILITY
251 9TH ST SE
ASSA ABLOY INC
MASONITE CORP - 12TH ST FACILITY
1600 12TH ST NE
MASONITE CORP.
GOLDEN GRAIN ENERGY LLC
1822 43RD ST SW
NA
KRAFT HEINZ FOODS CO
1022 12TH ST NW
THE KRAFT HEINZ CO
AG PROCESSING INC
1605 19TH ST SW
MASONITE CORP - 19TH ST FACILITY
2510 19TH ST SW
MASONITE CORP
HEIDELBERG MATERIALS US CEMENT LLC
700 25TH ST
HEIDELBERG MATERIALS US INC
Health Considerations for Residents Near REG MASON CITY LLC
Living near a Toxic Release Inventory (TRI) facility in MASON CITY, Iowa (50401) means potential exposure to industrial pollutants through air, water, and soil. While not every facility creates immediate health risks, long-term proximity warrants awareness and proactive steps.
Water Testing
Even with acceptable municipal water scores, homes near industrial sites should test annually for contaminants that may leach through groundwater. This is especially important for homes built before 1990 or those on well water in the 50401 area. Testing kits are available through your county health department or certified labs.
Air Quality Monitoring
Monitor daily AQI (Air Quality Index) at airnow.gov, particularly on hot, stagnant days when ground-level pollutants concentrate. If you notice unusual odors or visible emissions from REG MASON CITY LLC, report them to Iowa's environmental agency.
When to Consult a Doctor
Speak with your physician if you experience persistent respiratory symptoms (chronic cough, wheezing, shortness of breath), unexplained headaches, skin irritation, or unusual fatigue — particularly if these worsen when you're at home. Mention your proximity to a TRI facility so they can order appropriate screening. Vulnerable populations — children, elderly, pregnant women, and those with asthma — should be especially vigilant.
Explore More
Data sources: EPA Toxic Release Inventory (TRI), EPA Safe Drinking Water Information System (SDWIS), EPA Air Quality System (AQS). Facility ID: 50401FRDMF41721. Last updated: August 2026.