This report is provided to inform you about the source and quality of your drinking water, and how it compares to national drinking water standards. This report is a snapshot of last year's water quality. Please take a moment to review this important information.

Water Source

The Unified Alaskan Utilities - Sherwood Estates District water system is supplied by 1 Groundwater well located at the end of Fountain Dale Circle.

Water Treatment

The Sherwood Estates District water source has been determined by the Alaska Department of Environmental Conservation to be Vulnerable Groundwater.

To meet the treatment requirements associated with a vulnerable classification, Sodium Hypochlorite (Chlorine) is added as a disinfectant, and a chlorine disinfectant residual is maintained and monitored on a daily basis.

The well water also contains high levels of Iron and Manganese. A filter system is employed to remove those contaminants.

Source Assessment

The Alaska Department of Environmental Conservation has not yet completed a source water assessment for Alpat Water Utility - Sherwood Estates Division. When a source water assessment has been completed, you will be able to request an executive summary of the assessment.

Basic 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, in some cases, radioactive material, 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 used.


Some people may be more vulnerable to contaminants in drinking water than the general population. The following people may be more at risk from infections due to water impurities:

  • 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
  • Elderly Persons
  • Infants

These people should seek advice about drinking water from their healthcare 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


Impurities in the Water

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some impurities. The presence of impurities does not necessarily indicate that water poses a health risk. More information about impurities and potential health effects can be obtained by calling the EPA’s Safe Drinking Water Hotline (1-800-426-4791).

Testing Waivers

To eliminate unnecessary testing expense, the system has applied for testing waivers for the following:

An asbestos testing waiver has been granted due to no asbestos piping in the system. This waiver does not require renewal.

Synthetic Organic Chemicals (SOC)
An SOC sample set is required to be taken at least once within a "monitoring period" which operates on a 3 year cycle. The system may apply for an SOC waiver within the 3 year monitoring period, which can only be granted if there is no potential sources of SOC contamination located within the water collection area.

Because SOC samples are very expensive and there is no history of SOC contamination within the collection area, we apply for this testing waiver every monitoring period. So far, this waiver has been granted every time an application has been submitted. If the waiver is ever rejected, we will be sure to notify you in the following water quality report.


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. This utility 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 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

Water Quality Testing

Because of the numerous potential sources and varieties of impurities, state and federal law mandates the routine testing for all impurities (over 80) known to pose a risk to public health. Some impurities can affect water sources quickly and others are not expected to vary significantly from year to year. Thus, testing schedules also vary from monthly to once every nine years, depending on risk and the impurity tested. Your water system is routinely monitored for all applicable hazardous impurities. However, of those impurities, only those detected in routine testing are listed in the Detected Impurities table.

Detected Impurities

Impurity Year Units MCL MCLG Reported Value Range Violation Likely Source
Barium 2019 µg/L 2000 2000 24 N/A N Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits
Chlorine (as Cl₂) 2022 ppm 4 4 1.1 0.5-1.1 N Water additive used to control microbes
Haloacetic acids (HAA5) 2022 ppb 60 N/A 30 N/A N Byproduct of drinking water disinfection
Total Trihalomethanes (TTHMs) 2022 ppb 80 N/A 30.21 N/A N Byproduct of drinking water disinfection
Impurity Year Units MCL MCLG Reported Value Samples > MCL Violation Likely Source
Lead 2022 ppb 15 0 1.1 0 N Corrosion of household plumbing systems; erosion of natural deposits
Copper 2022 ppb 1300 1300 990 0 N Corrosion of household plumbing systems; erosion of natural deposits

Definitions And Terms

(Maxiumum Contaminant Level) The highest level of an impurity allowable in drinking water.
(Maximum Contaminant Level Goal) The amount of an impurity below which there is no known or expected health risk.
(Maximum Residual Disinfectant Level) The highest level of a disinfectant allowed in drinking water.
(Maximum Residual Disinfectant Level Goal) The level of a drinking water disinfectant below which there is no known or expected health risk.
(Action Level) The concentration of an impurity which, when exceeded, triggers treatment or other requirements that a water system must follow.
(Treatment Technique) A required process intended to reduce the level of an impurity in drinking water.
(Parts Per Million) This measure corresponds to one penny out of $10,000 or one minute out of about 2 years. 1 ppm is essentially one millionth of the total water volume.
(Milligrams Per Liter) This is another way of displaying PPM. See PPM for a definition.
(Parts Per Billion) This measure corresponds to one penny out of $10 Million or one minute out of about 2,000 years. 1 ppb is essentially one billionth of the total water volume.
(Micrograms Per Liter) This is another way of displaying PPB. See PPB for a definition.
(Parts Per Trillion) This measure corresponds to one penny out of $10 Billion or one second out of about 32,000 years. 1 ppt is essentially one trillionth of the total water volume.
(Picocuries Per Liter) This is a unit of radioactivity corresponding to one decay every 27 seconds in a volume of one liter of water, or 0.037 decays per second in every liter of air. For a comparison, an average banana contains about 520 Picocuries of radiation.
(Millirems Per Year) a Millirem is a measure of the health effect of low levels of ionizing radiation on the human body. For some perspective, eating a banana every day for a year would expose you to about 3.6 mrem/Yr.
(Nephelometric Turbidity Units) This is a precise measurement of how cloudy the water is. The higher the number, the cloudier the water is.

Home Filters

Although your water is rigorously tested, it may have aesthetic qualities you find objectionable such as iron, manganese, calcium, or sulfur smell. Some people may also have concerns about trace impurities not detected in routine testing. If you choose to filter, here are some tips to consider.


Improper media selection can cause poor results. Please consider the following guidance for successful general use filter selection.

*For mineral removal such as hardness, iron,  and manganese, water softening or green sand filtration is recommended.

*For taste and odor associated with chlorine and sulfur (rotten eggs), use carbon filters with carbon media.

*For fine particle removal, 5-10 micron cartridge media is best. Because of high maintenance costs, 1 micron or finer cartridges are seldom advised.

CAUTION: If a filter, including softeners, is not in use, it should be bypassed to prevent bacterial growth from contaminating your drinking water.

FILTER MAINTENANCE:   Many homes have cartridge style water filters installed either under the kitchen sink or large whole house filters installed where the water enters the house. These filters can be a source of harmful bacteria if they are not regularly maintained. As a general rule, filter cartridges should be replaced every 6 months although individual manufacturers specifications may vary. Symptoms of a plugged filter may be dirty water, unpleasant odor, or low pressure.

FILTER SELECTION FOR HEALTH CONCERNS:   Some people choose to filter their water to address specific health concerns or for general peace of mind. It is recommended that EPA’s filter selection guidance be consulted to assist with selection of an appropriate filter technology to address specific impurities of concern. Guidance can be found on the internet at

Maintenance & Emergency

Your water system is routinely maintained by Northern Utility Services, certified water system operators. If you have any questions or need to report an emergency, Northern Utility Services staff is pleased to assist you. Office hours are 8:00-5:00 Mon-Fri.

Tel: 907-222-4084

Emergency response is available via answering service 24 hours a day, 7 days a week.

System Contact

Unified Alaskan Utilities
Sherwood Estates District
Public Water System Identification (PWSID)



PO Box 233368
Anchorage, AK 99523


(907) 222-4084

Operator Contact

Northern Utility Services

(907) 222-4084