Water Quality Report
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2009 WATER QUALITY RESULTS  

 

Definitions for Contaminant Tables

 The following definitions are provided to assist you in understanding our water quality test results presented in the tables on the next two pages.

Action Level ( AL ) - The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.  

Maximum Contaminant Level (MCL) -  The “Maximum Allowed” is 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.  

Maximum Contaminant Level Goal (MCLG) - The “Goal” is the level of a contaminant in drinking water below which there is no known or expected risk to health.  MCLGs allow for a margin of safety.  

N/A – Not Applicable  

ND – Not Detected  

**Optimum Fluoride Level – 1.2  

MCL’s are set at very stringent levels.  To understand the possible health effects described for many regulated constituents, a person would have to drink 2 liters of water every day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect.

 Water Quality Data  

The following tables list the drinking water contaminants we detected during the 2009 calendar year.  In specific instances, the state allows us to test for some substances less than once per year because the concentrations of these sub-stances do not change significantly from year to year.  In these cases, where the last sample was taken prior to 2007, the sample date has been provided.  

As you can see by the table, we had no violations in any of the three geographic areas that comprise our system.  We’re proud that your drinking water meets or exceeds all Federal and State requirements.

2009 WATER QUALITY RESULTS
Kingbrook Phase I – Bruce Water Treatment Plant
Substance Sample Date Highest Level Detected Range of Detection Ideal Goals (MCLG) Highest Level Allowed (MCL) Units Likely source of substance
Inorganic Substances
Fluoride 11/3/09 1.43 1.22-1.43 1 4 ppm Water additive to promote strong teeth
Nitrate (as Nitrogen) 3/11/09 0.8 N/A 10 10 ppm Fertilizer runoff; leaking septic tanks; erosion of natural deposits
Water Quality Tests taken throughout the Distribution System
Total Trihalomethanes 8/24/09 12.4 5.8-12.4 N/A 80 ppb By-products of drinking water chlorination
Haloacetic Acids 8/24/09 36.9 13.3-36.9 N/A 60 ppb By-products of drinking water chlorination
Radioactive Substances
Alpha emitters 5/13/09 3.6 N/A 0 15 pCi/l Erosion of natural deposits
Water Quality Tests taken at the Consumer's Tap Located within Kingbrook Phase I
Substance  Sample Date  Level Detected
 (90th Percentile)		 # of Samples above the AL MCLG MCL Likely source of substance
Lead 7/15/09 2.7 0 0 AL = 15 Corrosion of household plumbing systems
Copper 7/15/09 0.32 0 0 AL = 1.3  Corrosion of household plumbing systems
Kingbrook Phase II – De Smet Water Treatment Plant
Substance Sample Date Highest Level Detected Range of Detection Ideal Goals (MCLG) Highest Level Allowed (MCL) Units Likely source of substance
Inorganic Substances
Arsenic 10/27/08 2 N/A N/A 50 ppb Erosion of natural deposits, runoff from orchards
Barium 10/27/08 0.032 N/A 2 2 ppm Erosion of natural deposits
Chromium 10/27/08 2.2 N/A 100 100 ppb Erosion of natural deposits
Fluoride 2/23/09 1.61 0.94-1.61 4 4 ppm Water additive to promote strong teeth
Nitrate (as Nitrogen) 5/20/09 <0.2 N/A 10 10 ppm Fertilizer runoff; leaking septic tanks; erosion of natural deposits
Selenium 10/27/08 0.6 N/A 50 50 ppb Erosion of natural deposits
Water Quality Tests taken throughout the Distribution System
Total Trihalomethanes 8/24/09 63.4 N/A N/A 80 ppb By-products of drinking water chlorination
Haloacetic Acids 8/24/09 18.6 N/A N/A 60 ppb By-products of drinking water chlorination
Water Quality Tests taken at the Consumer's Tap Located within Kingbrook Phase II
Substance  Sample Date  Level  Detected
(90th Percentile)		 # of Samples above the AL MCLG MCL Likely source of substance
Lead 7/14/09 3.9 0 0 AL = 15 Corrosion of household plumbing systems
Copper 7/17/09 0.37 0 0 AL = 1.3  Corrosion of household plumbing systems
                   
Kingbrook Phase III – Chester Water Treatment Plant
Substance Sample Date Highest Level Detected Range of Detection Ideal Goals (MCLG) Highest Level Allowed (MCL) Units Likely source of substance
Inorganic Substances
Barium 5/20/08 0.016 N/A 2 2 ppm Erosion of natural deposits
Chromium 5/20/08 2.2 N/A 100 100 ppb Erosion of natural deposits
Fluoride 9/15/09 1.32 1.01-1.32 4 4 ppm Water additive to promote strong teeth
Nitrate (as Nitrogen) 9/29/09 0.8 N/A 10 10 ppm Fertilizer runoff; leaking septic tanks; erosion of natural deposits
Selenium 5/20/08 0.8 N/A 50 50 ppb Erosion of natural deposits
Water Quality Tests taken throughout the Distribution System
Total Trihalomethanes 8/24/09 38.1 N/A 0 80 ppb By-products of drinking water chlorination
Haloacetic Acids 8/24/09 14.6 N/A 0 60 ppb By-products of drinking water chlorination    
Water Quality Tests taken at the Consumer's Tap Located within Kingbrook Phase III
Substance  Sample Date  Level Detected
(90th Percentile)		 # of Samples above the AL MCLG MCL Likely source of substance
Lead 8/3/07 5.4 0 0 AL = 15 Corrosion of household plumbing systems
Copper 8/7/07 0.93 0 0 AL = 1.3  Corrosion of household plumbing systems
Units and Abbreviations      
pCi/L: picocuries per liter (a measure of radioactivity)  
ppm: parts per million, or milligrams per liter (mg/l)  
ppb: parts per billion, or micrograms per liter (ug/l)  

Summary of 2009 Water Quality Test Results

Last year, we tested for more than 80 drinking water contaminants.  Only a very small number of these, as shown in the table, registered a detectable quantity.  Additionally, in each case, the detected quantity fell far short of the maximum limit.

 

Alpha Emitters are substances that naturally occur in rocks and soil.  The levels detected are well below those allowed by the EPA.

 

Arsenic occurs as a result of natural deposits or from runoff from orchards.  The levels detected are well below those allowed by the EPA.

 

Barium occurs as a result of erosion of natural deposits and was detected in the Big Sioux and Vermillion Aquifers at an insignificant quantity.

 

Chromium occurs as a result of erosion of natural deposits and was detected at levels dramatically lower than the highest level allowed by EPA.

 

Fluoride is naturally present at low levels in our water.  In addition, we add fluoride to the water to

promote healthy teeth.

Nitrate levels in our water in 2009 were found at amounts consistent with our area land use and significantly below the highest level allowed by EPA.

 

Selenium is a naturally occurring substance found in the soil and rocks of this region.  Detected quantities were significantly below maximum allowable levels. 

 

Lead and Copper levels are normally a function of home plumbing fixtures. Infants and young children are typically more vulnerable to lead in drinking water than the general population. It is possible that lead levels at your home may be higher than at other homes throughout the system as a result of materials used in your home's plumbing.  If you are concerned about elevated lead levels in your home's water, you may want to have your water tested.  Additional information is available from the Safe Drinking Water Hotline (1-800-426-4791).

 Total Trihalomethanes (TTHM) and Haloacetic Acids are chemicals produced by the chlorination of drinking water. Detected levels found were well below the highest level currently allowed by EPA.

 

                                Kingbrook Rural Water is an equal opportunity employer and provider.

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Last modified: June 18, 2010