Anything which is injurious to the public health or an obstruction to the free use of any waters of the state.

Particles in the air less than 2.5 micrometers in diameter. Often referred to as "fine" particles.  Also see PM10.

Facilities that emit 100 tons per year or more of any regulated air pollutant, or 10 tons per year or more of any single hazardous air pollutant (specifically listed in the Clean Air Act), or 25 tons [..]

A process or activity involving application of wastewater, surface water, or semi-liquid material to the land surface for the purpose of treatment, pollutant removal, or ground water recharge.  Also s [..]

A facility that manages exclusively solid wood, bark, or wood fiber generated from wood product manufacturing.

Young fish born the year captured; seen as evidence of spawning activity.

An area that at least some of the time is saturated by surface or ground water.  Examples include swamps, bogs, and marshes. 

The width of a water surface measured perpendicular to the direction of flow.

An index of the cross section shape of a stream channel at bankfull level.

A program established under the 1986 amendments to the Safe Drinking Water Act, with the goal of minimizing the likelihood of contamination to public water systems supplied by ground water. In general [..]