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Spring/Summer 2020 Page 7

City of Mount Clemens Public Water System

The table below lists drinking water contaminants detected in 2019. The presence of these contaminants does not
necessarily indicate the water poses a health risk. All testing was conducted in 2019, unless noted otherwise.

Regulated Level Range of Sample Violation
MCL MCLG Typical sources of contaminant
contaminant detected detection date yes/no
Erosion of natural deposits; discharge from
Fluoride (ppm) 4 4 < .08 n/a 8/14/19 no
fertilizer and aluminum factories
Bromate (ppb) 10 0 1.65 1.1 - 2.4 Quarterly no By-product of drinking water disinfection
Combines
Radium (pCi/L) 5 0 .33 n/a 8/6/14 no Erosion of natural deposits

Regulated Running annual Violation Typical source of
contaminant Treatment technique average Monthly ratio range yes/no contaminant
Total organic carbon (TOC) removal ratio is calculated as the ratio between the actual
Total organic Naturally present
carbon (ppm) TOC removal and the TOC removal requirements. The TOC was measured quarterly no in the environment
and because the level was low, there is no TOC removal requirement

Special Monitoring and unregulated contamination** Level detected Sample date Source of contamination
Sodium (ppm) 16 8/14/19 Erosion of natural deposits

Contaminant subject to Action 90th Monitoring Number of samples
action level level percentile period above action level Range of individual results
Lead (ppb) 15 5 2019 2 0 ppb - 990 ppb
Copper (ppm) 1.3 .1 2019 1 0 ppm - 1.4 ppm
**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. The City of Mount Clemens tested a wide variety
of unregulated contaminants in 2018. The unregulated contaminant tests are available to customers by contacting the Mount Clemens
Utilities Department.

2019 Turbidity - monitored every 4 hours at the plant finished water tap
Highest single measurement can’t Lowest monthly percentage of samples meeting Violation Major source in
exceed 1 NTU turbidity limit of .3 NTU (min. 95%) yes/no drinking water

.16 NTU 100 % no Soil runoff

2019 Disinfection Residuals and Disinfection By-products - monitoring in distribution system
Regulated Test Health Allowed Level Range of Violation Major sources in
contaminant date Unit goal MCLG level MCL detected detection yes/no drinking water
Total Trihalomethanes By-product of drinking
(TTHM) 2019 ppb n/a 80 49 15 - 86 no water chlorination
Haloacetic Acids By-product of drinking
2019 ppb n/a 60 31 20 - 69 no
(HAA5) water disinfection
Disinfectant (Chlorine) Water additive used to
Residual (ppm) 2019 ppm MRDGL 4 4 .67 .02 - 1.4 no control microbes

Microbial Number Violation Typical source of
contaminants MCL MCLG detected yes/no contaminant
Total Coliform 1 positive monthly sample (5% of monthly samples 0 0 in 1 month no Naturally present in the
bacteria positive) environment
Fecal Coliform Routine and repeat sample total Coliform positive, 0 0 in 1 month no Human and animal fecal
and E. coli and one is also fecal or E. coli positive waste