What environmental databases are included?

This page aggregates data from eight EPA databases: Safe Drinking Water (SDWIS), Superfund/NPL sites, Toxic Release Inventory (TRI), Air Quality Index (AQI), Leaking Underground Storage Tanks (LUST), NPDES water discharge permits, RCRA hazardous waste, and Brownfields.

What does the Air Quality Index (AQI) mean?

AQI is measured on a scale from 0 to 500. Values under 50 are 'Good,' 51-100 is 'Moderate,' and above 100 is 'Unhealthy for Sensitive Groups.' AQI is measured at the county level since air quality monitoring stations are sparse. Your town shares its county's AQI reading.

What is a Superfund site?

A Superfund site is a location contaminated by hazardous waste that has been placed on the EPA's National Priorities List (NPL) for long-term cleanup. These sites pose serious risks to human health and the environment. Cleanup can take decades and cost hundreds of millions of dollars.

Monrovia, CA Water Quality, EPA Sites & Air Quality Data

CSALos Angeles-Long Beach MSALos Angeles-Long Beach-Anaheim#60/122 Home Value

Environmental Reporti

Water Systemsi

1community / 3 total

Water Violationsi

TRI Facilitiesi

921.5K lbs reported

Active NPDESi

3/ 27 total

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

Active Systemsi

Recent Violationsi

Transient (2)

Community (1)

Recent Violations (Last 5 Years)

MONROVIA-CITY, WATER DEPT.

1 violationLatest: 2023-05-01

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

With Chemical Datai

Total Reported Releasesi

21.5K lbs

3M CO - MONROVIA TAPE1601 S SHAMROCK AVE5 chemicals|TRI

DECCO US POSTHARVEST INC1713 S CALIFORNIA AVE5 chemicals|TRI

MASK-OFF CO INC345 W MAPLE AVE4 chemicals|TRI

SOLVENTUM ORTHODONTICS CORP2724 SOUTH PECK ROAD2 chemicals|TRI

DUCOMMUN AERO STRUCTURES INC801 ROYAL OAKS DR1 chemical|TRI

ELECTROCUBE INC1307 S MYRTLE AVE1 chemical|TRI

MCDONNELL DOUGLAS AEROSPACE CO700 ROYAL OAKS DR|TRI

AVERY DENNISON1620 S CALIFORNIA AVE|TRI

AVERY DENNISON LABEL SYSTEM1616 S CALIFORNIA|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

Expired / Terminatedi

PHOTON SPOT INC142 W OLIVE AVEIndustrial Stormwater|EPA

SR 57/60 CONFLUENCE CHOKEPOINT RELIEF PROGRAM (PHASE II)1333 SOUTH MAYFLOWERMinor Discharge|EPA

PACIFIC PLATE BREWING COMPNAY1999 S MYRTLE AVEIndustrial Stormwater|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.

VEOLIA ES TECHNICAL SOLUTIONS, L.L.C.AZUSA4.1 mi|EPA

SAFETY-KLEEN SYSTEMS, INC.EL MONTE6.6 mi|EPA

QUEMETCO INCINDUSTRY9.6 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.

TROTTER APARTMENTS829 W. OLIVE AVENUEIn Progress|EPA