2006 WATER QUALITY REPORT

FOR

CARSON WATER SUPPLY

 

This report contains important information regarding the water quality in our water system. The source of our water is groundwater. Our groundwater is drawn from the alluvial and Dakota Sandstone aquifers.

Our water quality testing shows the following results:

CONTAMINANT

MCLG

MCL

DETECTED LEVEL

DATE SAMPLED

RANGE OF DETECTION

VIOLATION

SOURCE

Barium (ppm)

2

2

0.22

4/12/04

N/A

No

Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits

Copper (ppm)

1.3

AL =1.3

0.2

6/1/04 9/30/06

0.07 0.32

No

Corrosion of household

plumbing systems; Erosion

of natural deposits

Fluoride (ppm)

4

4

1.32

3/2006

0.94 1.32

No

Water additive which promotes strong teeth; Erosion of natural deposits; Discharge from fertilizer and aluminum factories

Lead (ppb)

0

AL =15

3

6/1/2004 9/30/2006

ND - 4

No

Corrosion of household plumbing systems; erosion of natural deposits

Nitrate [as N] (ppm)

10

10

1.2

1/1/06 12/31/06

1.2 1.2

No

Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits

TTHM (ppb) [Total trihalomethanes]

N/A

80

33

7/18/05

NA

No

By-products of drinking water disinfection

Haloacetic Acids

(HAA5) (ppb)

N/A

60

14

7/18/05

Na

No

By-products of drinking

water disinfection

Chlorine (ppm)

MRDLG

=4.0

MRDL=4.0

2.03

2006 RAA

1.40 2.87

No

Water additive used to

control microbes

Sodium (ppm)

N/A

N/A

28

4/12/04

NA

No

Erosion of natural deposits; Added to water during treatment process

 

Note: Contaminants with dates indicate results from the most recent testing done in accordance with regulations.

 

DEFINITIONS

 

•  Maximum Contaminant Level (MCL) 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 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.

•  ppb -- parts per billion.

•  ppm -- parts per million.

•  pCi/L picocuries per liter

•  N/A Not applicable

•  ND -- Not detected

•  Treatment Technique (TT) A required process intended to reduce the level of a contaminant in drinking water.

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

•  Maximum Residual Disinfectant Level Goal (MRDLG) - The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.

•  Maximum Residual Disinfectant Level (MRDL) - The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

•  RAA Running Annual Average

 

GENERAL INFORMATION

 

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water posed a health risk. More information about contaminants or potential health effects can be obtained by calling the Environmental Protection Agency's Safe Drinking Water Hotline (800-426-4791).

 

Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791).

 

SOURCE WATER ASSESSMENT INFORMATION

 

The Carson water supply obtains its water from the alluvial and the Dakota Sandstone aquifers. The alluvial and Dakota Sandstone aquifers were determined to be highly susceptible to contamination because the characteristics of the aquifers and overlying materials allow contaminants to move through the aquifers fairly quickly. The wells will be most susceptible to activities such as dry cleaners, gas stations, industrial sites, and municipal wastewater dischargers. A detailed evaluation of your source water was completed by the IDNR, and is available from City Hall at 712-484-3636.

 

OTHER INFORMATION

 

Our water utility is making every effort to protect the water system from potential security threats. You, as customers, can also help. If you see any suspicious activity near the water tower, treatment plant, wells or fire hydrants, please contact the sheriff department. We appreciate your assistance in protecting the water system.

 

As most of you know Ben Brandes has been working for the City for the past 1 ½ years. Approximately 9 months ago Ben received his Grade 1 Waste Water Treatment Plant Operators License. As of April 2007 he has now received his Grade 1 Water Treatment Plant Operators License. Congratulations Ben!

 

CONTACT INFORMATION

 

For questions regarding this information, please contact Ron Stillinger at 712-484-3636 during the following hours: 8am 4:30pm .

 

Decisions regarding the water system are made at the City Council meetings held on the second Monday at 7:30 p.m. at city hall and are open to the public.

 

Note: This report will not be mailed.