City of Mission Water System 2018 Water Quality Report

City of Mission Water System

2018 Water Quality Report

(PWS ID: 084690532)

A look at your local water quality: 

In compliance with the 1996 Safe Drinking Water Act Amendments, the City of Mission is providing our water users with this report on the quality of our drinking water. This report presents data compiled during the past twelve months from January 1, 2018 to December 31, 2018.

The City of Mission is pleased to inform the public that the water is “safe” and meets all federal Drinking Water Standards. During this reporting year the water was tested for bacteriological contaminants, nitrate, and other contaminants listed below. All water samples were analyzed at a certified laboratory. Reports are on file at the City of Mission Finance Office, USEPA Region 8 office, and contract lab. 

You should know:

Some persons 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 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 risk of infection by Cryptosporidium are available from the Safe Drinking Water Hotline (1-800-426-4791).

Did you know:

Contaminants that may be present in source water include:

• Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife

• Inorganic contaminants, such as salts and metals, which can be naturally-occurring or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming.

• Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.

• Organic chemical contaminants including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, can come from gas stations, urban stormwater runoff, and septic systems.

• Radioactive contaminants, which can be naturally-occurring or be the result of oil and gas production and mining activities.

In order to ensure that tap water is safe to drink, EPA prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled-water that must provide the same protection for public health.

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 poses a health risk. More information about contaminants and potential health effects can be obtained by calling RST Water Resources at (605) 747-2559 ext. 262 or the EPA’s Safe Drinking Water Hotline (800) 426-4791.

Water Source:

Our water source is the Sicangu Mni Wiconi Water System which receives water from the OST-Mni Wiconi Core Plant in Ft. Pierre, SD. Surface water from Lake Sharpe located directly below the Oahe Dam is collected through a large intake pipe located 75 ft. off shore and 19 ft. below the water surface at high level in the main channel of the Missouri River. The finished treated water meets or exceeds the Safe Drinking Water Act (SDWA) requirements for drinking water which is distributed to residential users.

The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.


The Sicangu Mni Wiconi Water is treated at the Mni Wiconi Water Treatment Plant using conventional filtration. Chloramines are used as a disinfectant to eliminate coliform bacteria and pathogenic viruses. 

Bacteriological Monitoring:

Bacteriological monitoring is performed monthly to test for the presence of coliform bacteria, fecal coliform, and E.coli. Our system is required to collect two samples per month as defined by the size and population served. 

Failure to Monitor Violation Received for Total Coliform Bacteria

We are required to monitor your drinking water for total coliform bacteria on a regular basis. Results of regular monitoring are an indicator of whether or not our drinking water meets health standards. During the month of December we did not complete all monitoring for total coliform bacteria and therefore cannot be sure of the quality of water during that time.

We did collect the required total coliform samples in January 2019 and those samples were determined to be safe.

Chemical Monitoring:

Note to our water users: The USEPA requires us to monitor for certain contaminants or parameters in source waters before systems are initiated. Samples are required once again during a three-year compliance period. Any contaminants over the MCL reported in the initial sampling will have increased sample-monitoring schedules. Systems reporting low to zero levels may be issued a waiver and allowed to take fewer samples during the compliance period.

Lead Monitoring:

If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. The City of Mission is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your drinking water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at

Local water quality contacts:

Questions regarding your local water quality can be directed to the City of Mission Finance Office at (605) 856-4499. Copies of this report will not be mailed to everyone on our system. If you would like a copy please stop by the Mission City Office located at 121 S Main Street, Mission SD. Our commitment is to provide quality water on tap to the people of Mission and surrounding areas. 

Published once at the total approximate cost of $607.38

Published: June 12, 2019

PO Box 229, Mission, SD 57555 • 605-856-4469 • This email address is being protected from spambots. You need JavaScript enabled to view it.