Page 4 - 2019 Clean Water Report

Key to abbreviations:
Lead & Copper - Tested at customer taps
AL– Action Level: The concentration of a contaminant which, if
exceeded, triggers treatment or other requirement which a water
system must follow. 90% of
Results
EPA – Environmental Protection Agency
Contaminant EPA were
MCL– Maximum Contaminant Level: The highest level of a (units) Action Less # of Sites Typical Source of
contaminant that is allowed in drinking water. MCLs are set as Level MCLG Than over AL Violation Contaminant
close to the MCLGs as feasible using the best available treatment
technology.
90% of
MCLG– Maximum Contaminant Level Goal: The level of a Copper (ppm) homes 0 ppm .85 ppm 0 out of 30 NO Corrosion of
contaminant in drinking water below which there is no known or (07/22/16) less than household plumbing
expected risk to health. MCLGs allow for a margin of safety. 1.3 ppm

Level 1 Assessment – A Level 1 assessment is a study of the water 90% of
system to identify potential problems and determine (if possible)
why total coliform bacteria have been found in our water system. Lead (ppb) homes 0 ppb 1.1 ppb 0 out of 30 NO Corrosion of
(07/22/16) less than household plumbing
Level 2 Assessment – A Level 2 assessment is a very detailed 15 ppb
study of the water system to identify potential problems and
determine (if possible) why an E. coli MCL violation has occurred
and/or why total coliform bacteria have been found in our water
system on multiple occasions.
Inorganic & Organic Contaminants - Tested in drinking water
MRDL– Maximum Residual Disinfectant Level. The highest level of
a disinfectant allowed in drinking water
MRDLG– Maximum Residual Disinfectant Level Goal. The level of a Highest
drinking water disinfectant below which there is no known or expected Contaminant Average
risk to health (Date, if EPA’S or Single
sampled in Limit Test Typical Source of
N/A– Not Applicable (does not apply).
previous year) MCL MCLG Result Range Violation Contaminant
NTU– Nephelometric Turbidity Units: A measure of the cloudiness
of the water (turbidity). Runoff from fertilizer
use; Leaching from
10.4 10 0.00 - 0.56
pCi/l– Picocuries per liter: A measure of radioactivity Nitrate 0.56 ppm NO septic tanks, sewage;
ppm ppm ppm
Erosion of natural
ppb– Parts per billion, which can also be expressed as micrograms deposits.
per liter (μg/l).
ppm– parts per million, which can also be expressed as milligrams Discharge of drilling
per liter (mg/i) wastes; Discharge
Barium 2 ppm 2 ppm 0.04 ppm N/A NO from metal refineries;
PWSID– Public water system identification Erosion of natural
deposit.
TT– Treatment Technique: A required process intended to reduce
the level of a contaminant in drinking water.
0.00 - Discharge from factories
Tetrachlorethylene 5 ppb 0 ppb 0.57 ppb NO
Variances and Exemptions– State or EPA permission not to meet an 0.57 ppb and dry cleaners
MCL or a treatment technique under certain conditions.

City of Champlin 2018 Drinking Water Report | 4