|
Inorganic Contaminants |
|||||||
|
Contaminant and Unit of Measurement |
Dates of sampling (mo/yr) |
MCL Violation Y/N |
Level Detected |
Range of Results |
MCLG |
MCL |
Likely Source of Contamination |
|
Barium (ppm) |
05 / 2018 |
N |
0.0152 |
N/A |
2 |
2 |
Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits |
|
Chromium (ppb) |
05 / 2018 |
N |
1.5 |
N/A |
100 |
100 |
Discharge from steel and pulp mills; erosion of natural deposits |
|
Fluoride (ppm) |
05 / 2018 |
N |
0.396 |
N/A |
4 |
4.0 |
Erosion of natural deposits; discharge from fertilizer and aluminum factories. Water additive which promotes strong teeth when at the optimum level of 0.7 ppm |
|
Sodium (ppm) |
05 / 2018 |
N |
11.1 |
N/A |
N/A |
160 |
Salt water intrusion, leaching from soil |
|
Nickel (ppb) |
05 / 2018 |
N |
2.5 |
N/A |
N/A |
100 |
Pollution from mining and refining operations. Natural occurrence in soil |
|
Nitrate (as Nitrogen) (ppm) |
05 / 2019 |
N |
0.258 |
N/A |
10 |
10 |
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits |
|
Stage 1 Disinfectants |
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|
For chlorine, the level detected is the highest running annual average (RAA), computed quarterly, of monthly averages of all samples collected. The range of results is the range of results of all the individual samples collected during the past year. |
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|
Disinfectant and Unit of Measurement |
Dates of sampling (mo./yr.) |
MRDL Violation Y/N |
Level Detected |
Range of Results |
MRDLG |
MRDL |
Likely Source of Contamination |
|
Chlorine (ppm) |
2019 |
N |
1.22 |
0.43 – 1.56 |
4 |
4.0 |
Water additive used to control microbes |
|
Stage 2 Disinfectants and Disinfection By-Products |
|||||||
|
Contaminant and Unit of Measurement |
Dates of sampling (mo/yr) |
MCL Violation (Y/N) |
Level Detected |
Range of Results |
MCLG |
MCL |
Likely Source of Contamination |
|
Total Trihalomethanes (TTHM) System (ppb) |
Quarterly 2019 |
Y |
81.98 (highest LRAA) |
40.50 – 106 |
NA |
MCL = 80 |
By-product of drinking water disinfection |
|
Total Trihalomethanes (TTHM) Site 1 (ppb) |
Quarterly 2019 |
Y |
81.98 (highest LRAA) |
40.50 – 106 |
NA |
MCL = 80 |
By-product of drinking water disinfection |
|
Total Trihalomethanes (TTHM) Site 2 (ppb) |
Quarterly 2019 |
Y |
77.87 (highest LRAA) |
49.6 – 90.50 |
NA |
MCL = 80 |
By-product of drinking water disinfection |
|
Haloacetic Acids (five) (HAA5) system (ppb) |
Quarterly 2019 |
N |
35.05 (highest LRAA) |
21.30 – 48.80 |
NA |
MCL = 60 |
By-product of drinking water disinfection |
|
Haloacetic Acids (five) (HAA5) site 1 (ppb) |
Quarterly 2019 |
N |
35.05 (highest LRAA) |
24.30 – 41.40 |
NA |
MCL = 60 |
By-product of drinking water disinfection |
|
Haloacetic Acids (five) (HAA5) site 2 (ppb) |
Quarterly 2019 |
N |
33.45 (highest LRAA) |
21.30 – 48.80 |
NA |
MCL = 60 |
By-product of drinking water disinfection |
|
TTHM Monitoring Results (ppb) |
1/3/2019 |
4/4/2019 |
7/1/ 2019 |
10/3/2019 |
|
1826 River Ave NE – Quarterly Results |
106.00 |
74.89 |
71.52 |
40.50 |
|
1826 River Ave NE – LRAA* |
74.95 |
80.35 |
81.98 |
73.23 |
|
1306 SE Riverside – Quarterly Results |
90.50 |
65.87 |
50.66 |
49.60 |
|
1306 SE Riverside – LRAA* |
72.18 |
77.87 |
73.73 |
64.16 |
