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  2. /Ohio
  3. /Warren County
  4. /Mason
CSACincinnati-WilmingtonMSACincinnati#6/139 Population

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Environmental Reporti

Air Qualityi

44Good

Water Systemsi

4community / 10 total

Water Compliancei

Clean

TRI Facilitiesi

1310 lbs reported

Active NPDESi

3

Air Quality — Warren County (2025)i

AQS

The Air Quality Index measures how clean or polluted the air is on a given day. AQI is reported at the county level. A score of 0–50 is considered good; 51–100 is moderate; above 100 may be unhealthy for sensitive groups.

44
Good

Median AQI

050100150200300
max 126

PM2.5 Daysi

100

Ozone Daysi

172

Drinking Wateri

SDWIS

Public water systems registered to serve this area. Community systems (CWS) provide water to residents year-round. Transient systems serve places like gas stations or restaurants. Violations indicate a system failed to meet federal drinking water standards.

Community Systemsi

4

Active Systemsi

1

Recent Violationsi

0
Transient (5)
Community (4)
Non-Transient (1)

Historical Violations (Over 5 Years Ago)

SHADOW LAKE VILLAGE MHP

1 violationLatest: 2000-07-01
EPA

Toxic Release Inventory (TRI)i

TRI

Factories, refineries, and other industrial facilities that use or store hazardous chemicals are required to report their releases annually to the EPA. Being listed here does not mean a violation occurred — it means the facility is transparently tracking its chemical usage.

Reporting Facilitiesi

13

With Chemical Datai

12

Total Reported Releasesi

10 lbs
BLACKHAWK AUTOMOTIVE PLASTICS INC.4219 US RT 425 chemicals|TRI
MITSUBISHI ELECTRIC AUTOMOTIVE AMERICA INC.4773 BETHANY RD5 chemicals|TRI
HARRIS PRODUCTS GROUP4501 QUALITY PL4 chemicals|TRI
MAUSER - MASON1229 CASTLE DR2 chemicals|TRI
BONSAL AMERICAN INC THIS FACILITY CLOSED AS OF 11/30/20107300 INDUSTRIAL ROW DR2 chemicals|TRI
L3HARRIS CINCINNATI ELECTRONICS CORP7500 INNOVATION WAY1 chemical|TRI
HAMILTON SAFE INC-MASON755 READING RD1 chemical|TRI
UBE AUTOMOTIVE NORTH AMERICA MASON PLANT INC4600 MASON MONTGOMERY RD1 chemical|TRI
RELIANCE MEDICAL PRODUCTS INC3535 KINGS MILL RD1 chemical|TRI
AIR PLASTICS INC1224 CASTLE DR1 chemical|TRI
CINCINNATI FAN & VENTILATOR CO7697 SNIDER RD1 chemical|TRI
EPIC TECHNOLOGIES4240 IRWIN SIMPSON RD1 chemical|TRI
PORTION PAC INC7325 SNIDER RD|TRI

Wastewater & Stormwater Permits (NPDES)i

NPDES

Under the Clean Water Act, any facility that discharges wastewater or stormwater into rivers, lakes, or streams must hold an NPDES permit. "Effective" means the permit is currently active and the facility is authorized to discharge under its permit conditions.

Active Permitsi

3
MASON WWTP NO 23200 MASON MORROW MILLGROVE RDNPDES PRETREATMENT PROGRAM|EPA
PETROCHOICE LUBRICATION SOLUTIONS4291 STATE RTE 741Minor Discharge|EPA
SHADOW LAKE VILLAGE MHP2479 MASON-MONTGOMERY RDMinor Discharge|EPA

Nearest Hazardous Waste Disposal Facilitiesi

RCRA

These are the closest licensed facilities where hazardous waste (chemicals, solvents, industrial byproducts) can be legally treated, stored, or disposed of.

SAFETY-KLEEN SYS (403701)SHARONVILLE7.5 mi|EPA

Cleanup Sites (Brownfields)i

EPA Brownfields

Former industrial or commercial properties where contamination has been found. "Remedy Complete" means cleanup is finished. "Construction Complete" means cleanup infrastructure is built but monitoring continues. "In Progress" means the site is still being investigated or cleaned up.

MASON ROAD LEAD SITE4631 HICKORY WOODS DRIVEIn Progress|EPA