Lake Huron Water Treatment Plant
1999 Regulated Detected Contaminants Tables
CONTAMINANTS TEST
DATE		 UNITS HEALTH
GOAL
MCLG		 ALLOWED
LEVEL
MCL		 HIGHEST
DETECTED
LEVEL		 RANGE
LOW		 RANGE
HIGH

MAJOR SOURCES IN DRINKING WATER

Inorganic Chemicals - Annual Monitoring at Plant Finished Water Tap
     Fluoride Oct. 99 ppm 4 4 1.13 n/a n/a Erosion of natural deposits; Water additive, which promotes strong teeth; Discharge from fertilizer and aluminum factories
     Nitrate Oct. 99 ppm 10 10 0.24 n/a n/a Run off from fertilizer use; Leaching from septic tanks; Sewage; Erosion of natural soils.
Volatile Organic Compounds - Quarterly Monitoring at Plant Finished Water Tap
     Dichloromethane Mar. 99 ppb 0 5 0.29 0 0.29 Discharge from pharmaceutical and chemical factories.
Disinfection By-Products - Quarterly Monitoring in Distribution System
     Total Trihalomethanes 3/99-
12/99		 ppb n/a 100
*(80)

Average
15.3

 8.3 41.3 By-Product of Drinking Water Chlorination.
Total Trihalomethanes is the sum of chloroform, dichlorobromomethane, dibromomethane and bromoform. Compliance is based on the total.
*New MCL effective December 16, 2001

 

Turbidity - Monitored every four hours at Plant Finished Water Tap

Highest Single Measurement

 Lowest Monthly % of Samples Meeting
Turbidity Limit of 0.5 NTU (minimum 95%)

Soil Run Off

0.52 NTU

 99.5%

Turbidity is a measure of the cloudiness of water. We monitor it because it is a good indicator of the effectiveness of our filtration system. For turbidity levels 5 NTU or above a treatment technique (TT) is required.

 

Lake Huron Water Treatment Plant
1999 Unregulated Detected Contaminants Tables
Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted.
Contaminant Test Date Units *Future MCLG *Future MCL Average Level
Detected		 Range
Low		 Range
High
Fluorotrichloromethane 3/99-11/99 ppm n/a n/a 0.24 0 0.94
Trichloromethane 3/99-12/99 ppb 0 n/a 8.0 3.2 29.0
Bromodichloromethane 3/99-12/99 ppb 0 n/a 5.1 3.4 9.2
Dibromochloromethane 3/99-12/99 ppb 60 n/a 2.2 1.6 3.2
Bromoform 3/99-12/99 ppb 0 n/a 0.2 0 0.2

Chloroform, dichloromethane, dibromochloromethane, and bromoform are trihalomethanes.
The MCL is set for the total or sum of these individual components.
*New MCLG effective December 16, 2001


Springwells Water Treatment Plant
1999 Regulated Detected Contaminants Tables
CONTAMINANTS TEST
DATE		 UNITS HEALTH
GOAL
MCLG		 ALLOWED
LEVEL
MCL		 HIGHEST
DETECTED
LEVEL		 RANGE
LOW		 RANGE
HIGH

MAJOR SOURCES IN DRINKING WATER

Inorganic Chemicals - Annual Monitoring at Plant Finished Water Tap
     Fluoride Oct. 99 ppm 4 4 1.16 n/a n/a Erosion of natural deposits; Water additive, which promotes strong teeth; Discharge from fertilizer and aluminum factories
     Nitrate Oct. 99 ppm 10 10 0.22 n/a n/a Run off from fertilizer use; Leaching from septic tanks; Sewage; Erosion of natural soils.
Volatile Organic Compounds - Quarterly Monitoring at Plant Finished Water Tap
     Dichloromethane Aug 99 ppb 0 5 0.12 0 0.12 Discharge from pharmaceutical and chemical factories.
Disinfection By-Products - Quarterly Monitoring in Distribution System
     Total Trihalomethanes 3/99-
12/99		 ppb n/a 100
*(80)

Average
19.1

 11.0 30.0 By-Product of Drinking Water Chlorination.
Total Trihalomethanes is the sum of chloroform, dichlorobromomethane, dibromomethane and bromoform. Compliance is based on the total.
*New MCL effective December 16, 2001


Turbidity - Monitored every four hours at Plant Finished Water Tap

Highest Single Measurement

 Lowest Monthly % of Samples Meeting
Turbidity Limit of 0.5 NTU (minimum 95%)

Soil Run Off

0.52 NTU

 99.5%

Turbidity is a measure of the cloudiness of water. We monitor it because it is a good indicator of the effectiveness of our filtration system. For turbidity levels 5 NTU or above a treatment technique (TT) is required.


Springwells Huron Water Treatment Plant
1999 Unregulated Detected Contaminants Tables
Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted.
Contaminant Test Date Units *Future MCLG *Future MCL Average Level
Detected		 Range
Low		 Range
High
Trichloromethane 3/99-12/99 ppb 0 n/a 9.6 4.0 17.0
Bromodichloromethane 3/99-12/99 ppb 0 n/a 6.4 4.4 8.7
Dibromochloromethane 3/99-12/99 ppb 60 n/a 3.0 2.0 4.2
Bromoform 3/99-12/99 ppb 0 n/a 0.2 0.1 0.3

Chloroform, dichloromethane, dibromochloromethane, and bromoform are trihalomethanes.
The MCL is set for the total or sum of these individual components.
*New MCLG effective December 16, 2001


Key to Detected Contaminants Tables
Symbol Abbreviation for Definition/Explanation
MCLG Maximum Contaminant level Goal The level of contaminant in drinking water below which thee is no known or expected risk to health.
MCL Maximum Contaminant Level The Highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
ppb Parts per billion (one in one billion) The ppb is equivalent to micrograms per liter. A microgram = 1/1000 milligram.
ppm Parts per million (one in one million) The ppm is equivalent to milligrams per liter. A milligram = 1/1000 gram.
NTU Nephelometric Turbidity Units Measures the cloudiness of water.
TT Treatment Technique A required process intended to reduce the level of a contaminant in drinking water.
AL Action Level The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
n/a Not Applicable  
> More than or equal to