Eastern Report - Toho Water Authority

Lake Ajay Water System (PWS ID# 349-1956) continued
8
INORGANIC CONTAMINANTS
Contaminant
and Unit of
Measurement
Stage 1 Disinfectants and Disinfection By-Products
Disinfectant or
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL or
MRDL
Violation
Y/N
Level
Detected
Range of
Results
MCLG or
MRDLG
MCL or
MRDL
Likely Source of Contamination
Chlorine (ppm) 1/12-12/12 N 1.0 (RAA) 0.5-1.7 MRDLG = 4 MRDL = 4.0 Water additive used to control microbes
Haloacetic Acids
(five) [HAA5] (ppb)
Total
Trihalomethanes
[TTHM] (ppb)
Dates of
sampling
(mo/yr)
MCL
Violation
Y/N
Level
Detected
Range of
Results
Barium (ppm) 2/11 N 0.0222 0.0146-0.0222 2 2
Chromium
(ppb)
2/11 N 8.56 7.36 - 8.56 100 100
Fluoride (ppm) 2/11 N 0.759 0.643-0.759 4 4.0
Nickel (ppb) 2/11 N 1.52 ND - 1.52 N/A 100
Selenium (ppb) 2/11 N 2.18 ND– 2.18 50 50
MCLG MCL Likely Source of Contamination
Discharge of drilling wastes; discharge from
metal refineries; erosion of natural deposits
Discharge from steel and pulp mills; erosion of
natural deposits
Erosion of natural deposits; discharge from
fertilizer and aluminum factories. Water additive
which promotes strong teeth when at optimum
levels between 0.7 and 1.3 ppm
Pollution from mining and refining operations.
Natural occurrence in soil
Discharge from petroleum and metal
refineries; erosion of natural deposits;
discharge from mines
Sodium (ppm) 2/11 N 19 18.3 – 19.0 N/A 160 Salt water intrusion, leaching from soil
7/12 N 29.5 N/A N/A MCL = 60 By-product of drinking water disinfection
7/12 N 68 N/A N/A MCL = 80 By-product of drinking water disinfection