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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

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.

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