Environmental Engineering Reference
In-Depth Information
Maximum residual disinfectant level goal (MRDLG) —The level of a drink-
ing water disinfectant below which there is no known or expected
risk to health.
Microbiological contaminants— Used as indicators that other, potentially
harmful bacteria may be present
National Pollutant Discharge Elimination System (NPDES) —The national
program for issuing, modifying, revoking and reissuing, terminat-
ing, monitoring, and enforcing permits, in addition to imposing and
enforcing pretreatment requirements, under Sections 307, 402, 318,
and 405 of the Clean Water Act.
Navigable waters —Waters of the United States, including territorial seas.
pCi/L— Picocuries per liter (measure of radioactivity).
Person —An individual, corporation, partnership, association, state,
municipality, commission, or political subdivision of a state or any
interstate body.
Point source —Any discernible, confined, and discrete conveyance,
including but not limited to any pipe, ditch, channel, tunnel, con-
duit, well, discrete fissure, container, rolling stock, concentrated ani-
mal feeding operation, or vessel or other floating craft from which
pollutants are or may be discharged. This term does not include
agricultural stormwater discharges and return flows from irrigated
agriculture.
Pollutant —Dredged soil, solid waste, incinerator residue, filter back-
wash, sewage, garbage, sewage sludge, munitions, chemical wastes,
biological materials, radioactive materials (except those regulated
under the Atomic Energy Act of 1954), heat, wrecked or discarded
equipment, rock, sand, cellar dirt, or industrial, municipal, and agri-
cultural waste discharged into water. It does not include: (a) sewage
from vessels, or (b) water, gas, or other material that is injected into
a well to facilitate production of oil or gas, or water derived in asso-
ciation with oil and gas production and disposed of in a well, if the
well used either to facilitate production or for disposal purposes is
approved by authority of the state in which the well is located, and
if the state determines that the injection or disposal will not result in
the degradation of ground or surface water sources.
Public water system (PWS) —A system for the provision to the public of
piped water for human consumption, if such system has at least 15
service connections or regularly serves at least 25 individuals.
Publicly owned treatment works (POTW) —Any device or system used
in the treatment of municipal sewage or industrial wastes of a liq-
uid nature which is owned by a state or municipality. This defini-
tion includes sewer, pipes, or other conveyances only if they convey
wastewater to a POTW providing treatment.
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