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Annual Drinking Water Report |
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| ANNUAL DRINKING WATER REPORT |
| Annual Drinking Water Report |
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Dakota Dunes Community Improvement District
2007 Drinking Water Report
Water Quality
Last year, we monitored your drinking water for more than 80 possible contaminants. This brochure is a snapshot of the quality of the water that we provided last year. Included are details about where your water comes from, what it contains, and how it compares to Environmental Protection Agency (EPA) and state standards. We are committed to providing you with information because informed customers are our best allies.
Water Source
We serve more than 2,700 customers an average of 577,500 gallons of water per day. Our water is groundwater that we produce from local wells. The state has performed an assessment of our source water and they have determined that the relative susceptibility rating for the Dakota Dunes public water supply system is low.
Dakota Dunes CID also purchases water from Sioux City, Iowa. This is only a small percent of the water consumed. The Sioux City, IA contaminant reports are included.
For more information about your water and information on opportunities to participate in public meetings, call (605) 232-4211 and ask for Dave Fuehrer.
Additional Information
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 can pick up substances resulting from the presence of animals or from human activity.
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, and can also 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 which limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled water which 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 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 can be obtained by calling the Environment Protection Agency’s Safe Drinking Water Hotline (800-426-4791).
Detected Contaminants
The attached table lists all the drinking water contaminants that we detected during the 2007 calendar year. The presence of these contaminants in the water does not necessarily indicate that the water poses a health risk. Unless otherwise noted, the data presented in this table is from testing done January 1 – December 31, 2007. The state requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants are not expected to vary significantly from year to year. Some of the data, though representative of the water quality, is more than one year old.
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 in the community 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 wish to have your water tested and flush your tap for 30 seconds to 2 minutes before using tap water. Additional information is available from the Safe Drinking Water Hotline (800-426-4791).
The Dakota Dunes CID public water system purchases water from IA9778054. Information on detected contaminants must be included in this table. The IA9778054 is required to send this information to your system by April 1st.
2007Table of Detected Contaminants For Dakota Dunes CID (EPA ID 2093)
Terms and abbreviations used in this table:
* 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.
* 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.
* Action Level(AL): the concentration of a contaminant which, when exceeded, triggers treatment or other requirements which a water system must follow.
* Treatment Technique(TT): A required process intended to reduce the level of a contaminant in drinking water. For turbidity, 95% of samples must be less than 0.3 NTU
Units:
*MFL: million fibers per liter *pCi/l: picocuries per liter(a measure of radioactivity) *ppt: parts per trillion, or nanograms per liter
*mrem/year: millirems per year(a measure of radiation absorbed by the body) *ppm: parts per million, or milligrams per liter(mg/l) *ppq: parts per quadrillion, or picograms per liter
*NTU: Nephelometric Turbidity Units *ppb: parts per billion, or micrograms per liter(ug/l) *pspm: positive samples per month
Substance Highest Level Detected Range Date Tested Highest Level Allowed (MCL) Ideal Goal (MCLG) Units Major Source of Contaminant
Alpha emitters 2.7 05/30/07 15 0 pCi/l Erosion of natural deposits.
Barium 0.008 10/31/05 2 2 ppm Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits.
Chromium 4.9 10/31/05 100 100 ppb Discharge from steel and pulp mills; erosion of natural deposits.
Copper 0.4 #Sites>1.3 AL - 0 06/27/07 AL=1.3 0 ppm Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives.
Fluoride 1.49 1.06 – 1.49 05/21/07 4 4 ppm Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories.
Haloacetic Acids 12.8 08/20/07 60 0 pph By-product of drinking water chlorination.
Lead 3 #Sites>15 AL – 0 07/20/07 AL=15 0 ppb Corrosion of household plumbing systems; erosion of natural deposits.
Nitrate (as Nitrogen) 0.6 08/13/07 10 10 Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits.
Selenium 1.1 10/31/05 50 50 ppb Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines.
Total Coliform Bacterica 1 Positive samples 1 0 Naturally present in the environment.
Total trihalomethanes 72.4 10/31/05 80 50 ppb By-product of drinking water chlorination.
DENR supplies this information as a service to the Dakota Dunes CID public water system. It is the responsibility of the public water system to check this information against their sampling history and the regulations.
VIOLATION REPORT FOR SIOUX CITY, IA
For Violations: report any violation that has occurred during the year covered by the report. Identify any MCL, MRDL or TT violations in addition to monitoring and reporting compliance data, filtration and disinfection, lead and copper control requirements, record keeping of compliance data, special monitoring requirements, and violations of the terms of operation permit compliance schedules or administrative orders. A list of violations for this PWS is below.
Violation Contaminant Begin Date End Date
Type
Monitoring (MOR) Iowa Administrative Code 06/01/2007 06/30/2007
TOTAL COLIFORM / LEAD and COPPER REPORT FOR SIOUX CITY, IA
For Total Coliform (TCR): report the highest monthly number of positive samples for systems collecting fewer than 40 samples per month; or the highest
monthly percentage of positive samples for systems collecting at least 40 samples per month.
For Lead and Copper (90th and 95th): report the 90th percentile value of the most recent round of sampling and the number of sampling sites exceeding the
action level. Additionally for lead, the 95th percentile value of the most recent round of sampling.
Analyte MCL/AL MCLG Compliance Detect Samples Begin Date End Date Source
Type Value Min Max Total Exceed
Lead (ppb) AL=15 0 95th 5 0 19 30 1 6/1/2005 9/30/2007 Corrosion of household plumbing systems;
erosion of natural deposits
Lead (ppb) AL=15 0 90th 3 0 19 30 1 6/1/2005 9/30/2007 Corrosion of household plumbing systems;
erosion of natural deposits
Copper (ppm) AL=1.3 1.3 90th 1.2 0 1.3 30 0 6/1/2005 9/30/2007 Corrosion of household plumbing systems;
Erosion of natural deposits; Leaching from
wood preservatives
DETECT REPORT
For contaminants subject to an MCL: report the highest contaminant level used to determine compliance with the primary drinking water standard and the range of detected levels.
Where sampling is conducted quarterly, most compliance with an MCL is determined by calculating a running annual average (RAA). A running annual average is determined by calculating the arithmetic average of quarterly compliance values covering any consecutive four quarter period. These consecutive four quarter periods, although ending in the current report year, may include quarters from the previous year. The quarterly compliance values can be a quarterly sample average (QSA) if more than one quarterly sample is taken, or a single monitoring period sample (SGL) if only one quarterly sample is taken. If fewer than four quarters of sampling has been conducted, a quarterly QSA or SGL will be used.
Where sampling is conducted annually or less frequently, the highest detected level from the last monitoring period will be used. This is generally a single monitoring period sample (SGL).
For nitrate and nitrite sampling, the compliance value (SGL) is the highest detected level from the reporting period.
For detected unregulated contaminants for which monitoring is required from the reporting period, the range will be used.
3/14/2008 2007 CCR SIOUX CITY WATER SUPPLY PWSID: 9778054 Page 3
For nitrate and nitrite sampling, the compliance value (SGL) is highest detected level from the reporting period.
For detected unregulated contaminants for which monitoring is required from the reporting period, the range will be used.
FACILITY 950 DISTRIBUTION SYSTEM
MCL MCLG Compliance Sample Begin Date End Date Source
AL Type Value Min Max
Total Trihalomethanes (TTHM)
Total Trihalomethanes (ppb) 80 N/A RAA 54 24 92 1/1/2007 12/31/2007 By-products of drinking water disinfection
[TTHM]
Haloacetic Acids (HAA5)
Total Haloacetic Acids (ppb) 60 N/A RAA 23 14 41 1/1/2007 12/31/2007 By-products of drinking water disinfection
[HAA5]
FACILIT 01 1,2,5,6,8,9,10,11,19A,21,22CLLECT/PLNT
MCL MCLG Compliance Sample Begin Date End Date Source
AL Type Value Min Max
Radionuclides(RAD) - Other
Alpha Emitters (pCi/L) 15 0 SGL 3.5 N/A N/A 4/09/2007 4/09/2007 Erosion of natural deposits
Radionuclides(RAD) - Combined Radium
Combined Radium (pCi/L) 5 0 SGL 0.8 N/A N/A 6/16/2004 6/16/2004 Erosion of natural deposits
Inorganic Chemicals (IOC) - Regulated
Arsenic (ppb) 10 0 SGL 2 N/A N/A 6/22/2005 6/22/2005 Erosion of natural deposits; Runoff from orchards; Runoff
from glass and electronic production wastes
Barium (ppm) 2 2 SGL 0.05 N/A N/A 6/22/2005 6/22/2005 Discharge of drilling wastes; Discharge from metal refineries;
Erosion of natural deposits
Fluoride (ppm) 4 4 SGL 0.9 N/A N/A 6/22/2005 6/22/2005 Water additive which promotes strong teeth; Erosion of
natural deposits; Discharge from fertilizer and aluminum
Sodium (ppm) N/A N/A SGL 59 N/A N/A 6/18/2007 6/18/2007 Erosion of natural deposits; Added to water during treatment
process
Nitrate
Nitrate [as N] (ppm) 10 10 SGL 0.5 0.5 0.5 1/1/2007 12/31/2007 Runoff from fertilizer use; Leaching from septic tanks,
sewage; Erosion of natural deposits
Volatile Organic Chemicals (VOC) - Regulated
Trichloroethylene (ppb) 5 0 SGL 0.5 N/A N/A 4/09/2007 4/09/2007 Discharge from metal degreasing sites and other factories
3/14/2008 2007 CCR SIOUX CITY WATER SUPPLY PWSID: 9778054
Call Dakota Dunes CID for questions or a copy at (605) 232-4211.
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