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Annual Drinking Water Quality Report

CHILHOWIE

 

INTRODUCTION

This Annual Drinking Water Quality Report for calendar year 2015 is designed to inform you about your drinking water quality.  Our goal is to provide you with a safe and dependable supply of drinking water, and we want you to understand the efforts we make to protect your water supply.  The quality of your drinking water must meet state and federal requirements administered by the Virginia Department of Health (VDH).

If you have questions about this report, please contact:

John E. B. Clark, Jr., Town Manager at  276.646.3232

If you want additional information about any aspect of your drinking water or want to know how to participate in decisions that may affect the quality of your drinking water, please contact:

John E. B. Clark, Jr., Town Manager at 276.646.3232

The times and location of regularly scheduled board meetings are as follows:

Second Thursday of each month at 7:00 p.m. in Council Chambers, 325 East Lee Highway, Chilhowie VA 24319

 GENERAL 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:  (1) Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife.  (2) 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.  (3) Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.  (4) Organic chemical contaminants, including synthetic and volatile organic chemicals, which are byproducts of industrial processes and petroleum production, and can also come from gas stations, urban stormwater runoff, and septic systems.  (5) 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.  Food and Drug Administration 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 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 microbiological contaminants are available from the Safe Drinking Water Hotline (800-426-4791). 

 SOURCE and TREATMENT OF YOUR DRINKING WATER

The source of your drinking water is groundwater under the direct influence of surface water from three springs treated at the Chilhowie/Washington County Service Authority Membrane Filtration Plant. Treatment includes membrane filtration, chlorine disinfection and fluoridation.  In 2015 we also purchased surface water from WCSA from the Middle Fork of the Holston River.  Treatment includes by chemical and physical means including filtration to remove particulate matter, chlorination for disinfection, and fluoridation for the promotion of dental health

The Virginia Department of Health conducted a source water assessment of our system during 2001 and 2002.  The four sources were determined to be of highly susceptible to contamination using the criteria developed by the state in its approved Source Water Assessment Program.  The assessment report consists of Maps showing the source water assessment area, an inventory of known land use activities of concern, and documentation of any known contamination within the last 5 years.  The report is available by contacting John E. B. Clark, Jr., Town Manager at the phone number or address given elsewhere in this drinking water quality report.

 DEFINITIONS

Contaminants in your drinking water are routinely monitored according to Federal and State regulations.  The table on the next page shows the results of our monitoring for the period of January 1st to December 31st, 2015.  In the table and elsewhere in this report you will find many terms and abbreviations you might not be familiar with.  The following definitions are provided to help you better understand these terms:

Maximum Contaminant Level, or 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, or 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.

Non-detects (ND) - lab analysis indicates that the contaminant is not present

 Parts per million (ppm) or Milligrams per liter (mg/l) - one part per million corresponds to one minute in two years or a single penny in $10,000.

Parts per billion (ppb) or Micrograms per liter - one part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000.

Parts per trillion (ppt) or Nanograms per liter (nanograms/l) - one part per trillion corresponds to one minute in 2,000,000 years, or a single penny in $10,000,000,000.

Picocuries per liter (pCi/L) - picocuries per liter is a measure of the radioactivity in water.

Action Level (AL) - the concentration of a contaminant which, if 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.

Nephelometric Turbidity Unit (NTU) - nephelometric turbidity unit is a measure of the clarity, or cloudiness, of water. Turbidity in excess of 5 NTU is just noticeable to the average person.  Turbidity is monitored because it is a good indicator of the effectiveness of our filtration system.

 Maximum Residual Disinfectant Level Goal or MRDLG – the level of 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 or 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.

 WATER QUALITY RESULTS

  1. Regulated Contaminants

Contaminant  (units)

MCLG

MCL

Level Detected

Violation (Y/N)

Range

Date of Sample

Typical Source of Contamination

Nitrate (ppm)

10

10

0.98

N

0.35 – 0.98

2015

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

Fluoride (ppm)

4

4

0.72

N

ND – 0.72

2015

Water additive which promotes strong teeth

Barium (ppm)

2

2

0.036

N

0.027 – 036

2015

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

Chlorine (ppm)

MRDLG = 4

MRDL = 4

1.55

N

1.30 – 1.80

2015

Water additive used to control microbes

Haloacetic Acids (ppb)

NA

60

36

N

ND – 67

2015

By-product of drinking water disinfection

TTHMs [Total Trihalomethanes] (ppb)

NA

80

35

N

0.7 – 70

2015

By-product of drinking water disinfection

Turbidity (NTU)

NA

TT, 1 NTU Max

0.06

N

0.02 – 0.06

2015

Soil runoff

TT, ≤0.3 NTU 95% of the time

100%

N

NA

II Lead and Copper

Contaminant (units)

MCLG

Action Level

90th Percentile

Date of Sampling

# of Sampling Sites Exceeding Action Level

Typical Source of Contamination

Lead (ppb)

0

AL = 15

5.7

2015

0

Corrosion of household plumbing systems; Erosion of natural deposits

Copper (ppm)

1.3

AL = 1.3

0.45

2015

0

Corrosion of household plumbing systems; Erosion of natural deposits; Leaching from wood preservatives

The water quality results in table I is from testing done in 2015. However, the state allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently.  Some of our data, though accurate, is more than one year old.

MCL’s are set at very stringent levels by the U.S. Environmental Protection Agency.  In developing the standards EPA assumes that the average adult drinks 2 liters of water each day throughout a 70-year life span.  EPA generally sets MCLs at levels that will result in no adverse health effects for some contaminants or a one-in-ten-thousand to one-in-a-million chance of having the described health effect for other contaminants.

 Additional Information for Lead

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 Town of Chilhowie 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 two 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 (800-426-4791).

 Violation Information

Your water system did not have any MCL or TT violations during 2015.

Your water system did not have any monitoring violations during 2015.