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.

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

Environmental Reporti

Air Qualityi

51Moderate

Water Systemsi

6community / 16 total

Water Violationsi

Active NPDESi

0/ 5 total

Air Quality — Placer 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.

Moderate

Median AQI

050100150200300

max 143

PM2.5 Daysi

Ozone Daysi

170

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 (8)

Community (6)

Non-Transient (2)

Recent Violations (Last 5 Years)

ALPINE MEADOWS PROPERTY OWNERS ASSO

2 violationsLatest: 2023-01-01

EPA

Historical Violations (Over 5 Years Ago)

TIMBER HILLS MUTUAL WATER CO

77 violationsLatest: 2006-08-01

EPA

CENTRAL EDEN VALLEY IRR.

1 violationLatest: 1992-01-01

EPA

CAPE HORN WATER CO

1 violationLatest: 1992-01-01

EPA

NORTH EDEN VALLEY

51 violationsLatest: 2007-01-01

EPA

SHADY GLEN COMM WATER SYSTEM

44 violationsLatest: 2020-04-01

EPA

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

EV Charging & Alternative Fuel Stationsi

AFDC

Publicly listed alternative fuel and EV charging stations within the municipality. Data from the U.S. Department of Energy. "Open" stations are currently available for use; "Planned" stations are approved but not yet operational.

Total Stationsi

EV Stationsi

Level 2 Portsi

DC Fast Portsi

Non-Networked

Winner Chevrolet1624 S Canyon WayElectric2 L2 + 1 DCNon-Networked