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Page 4 Spring/Summer 2020

GLWA Water System: 2019 test results, detected contaminants

Results represent a combination of contaminants reported by the Northeast and Lake Huron water treatment plants.
The levels confirm that our water meets all state and federal guidelines for drinking water.

2019 Inorganic Chemicals - monitoring at the plant finished water tap
Regulated Test Health Allowe Highest Range of Violati
d level
on
level
goal
contaminant date Unit MCLG MCL detecte detectio yes/no Major sources in drinking water
n
d
Erosion of natural deposits; water additive,
Fluoride 6/11/19 ppm 4 4 .72 n/a no promoting strong teeth; discharge from
fertilizer and aluminum factories
Runoff from fertilizer use; leaching from
Nitrate 6/11/19 ppm 10 10 .48 n/a no septic tanks; sewage; erosion of natural
deposits
Discharge of drilling wastes; discharge from
Barium 5/16/17 ppm 2 2 .01 n/a no
metal refineries; erosion of natural deposits
2019 Disinfection By-products - monitoring in distribution system, Stage 2 disinfection by-products
Regulated Health Allowed Highest Range of Violation Major sources in
Test date Unit
contaminant goal MCLG level MCL LRAA detection yes/no drinking water
Total
Trihalomethanes 2019 ppb n/a 80 22.1 11.1 - 33.8 no By-product of drinking
water chlorination
(TTHM)
By-product of drinking
Haloacetic Acids 2019 ppb n/a 80 13.5 8 - 18 no
water disinfection
2019 Disinfectant Residuals - monitoring in distribution systems by treatment plant
Regulated Health Allowed Highest Quarterly Violation Major sources in
range of
containment Test date Unit goal MCLG level MCL RAA detection yes/no drinking water
Jan-Dec
Total Chlorine ppm 4 4 .74 .45 - .83 no Water additive used to
Residual 2019 control microbes
2019 Turbidity - monitored every 4 hours at the plant finished water tap
Violation
Highest single measurement Lowest monthly percentage of samples Major source in
Can’t exceed 1 NTU meeting turbidity limit of .3 NTU (min. 95%) yes/no drinking water
.13 NTU 100 % no Soil runoff
Typical source
Regulated contaminant Treatment technique 2019
of contaminant
The total organic carbon (TOC) removal ratio is calculated as the ration between the
Total organic carbon actual TOC removal and the TOC removal requirements. The TOC was measured each Erosion of natural
(ppm) deposits
quarter and because the level was low, there is no TOC removal requirement.
Special Monitoring 2019
Contaminants MCLG MCL Level detected 2019 Source of contamination

Sodium (ppm) n/a n/a 6.37 Erosion of natural deposits
The tables in this report are based on tests conducted by GLWA in the year 2019, or the most recent testing done within the last
five calendar years. GLWA conducts tests throughout the year. Only tests that show the presence of a substance or require
special monitoring are presented in these tables.

Unregulated contaminants are those for which EPA has not established drinking water standards. Monitoring helps EPA to
determine where these contaminants occur and whether it needs to regulate those contaminants.
Clinton Township tested a wide variety of unregulated contaminants during 2015, 2018 and 2019. The unregulated
contaminant tests are available to customers by contacting the Clinton Township Water Department.