Annual Drinking Water Quality Report

TOWN OF BIG STONE GAP

 

INTRODUCTION

 

This Annual Drinking Water Quality Report for calendar year 2016 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 call the Town of Big Stone Gap Water Treatment Plant at 276-524-1053 and ask for Gary Hampton.

 

The Big Stone Gap Town Council meets at 6:30 PM on the second Tuesday of each month at 505 East 5th St. South.

 

GENERAL INFORMATION

 

Drinking water, including bottled drinking 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). 

 

The sources of drinking water (both tap 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; and (5) Radioactive contaminants, which can be naturally-occurring or be the result of oil and gas production and mining activities. In order to insure 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.

 

 

SOURCE  AND TREATMENT OF YOUR DRINKING WATER

 

The source of your drinking water is surface water from Big Cherry Reservoir located in Wise County. The Virginia Department of Health and the Town of Big Stone Gap conducted a source water assessment of our system during 2002.  The Big Cherry Reservoir was determined to be of high susceptibility 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.  The report is available by contacting Mark S. Hollyfield, (276-679-7236).

 

Treatment of the raw water consists of coagulation, flocculation, sedimentation, filtration, stabilization, fluoridation, and chlorination.  These processes work together to remove the physical, chemical, and biological contaminants to make the water safe for drinking. The Town of Big Stone Gap welcomes tours at the water plant. Please call the water plant at 276-524-1053 to arrange a tour.

 

 

DEFINITIONS

 

The Town of Big Stone Gap routinely monitors constituents in your drinking water according to Federal and State regulations.  Many thousands of tests are performed each year to insure the quality of your drinking water. The table on the next page shows the results of our monitoring for the period of January 1st to December 31st, 2016.  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.  MCL’s 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.

 

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

 

Action Level - 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 (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 (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

  Regulated Contaminants  

Alpha Emitter (pCi/L)

0

15

<3

N/A

N

01/14/2015

Erosion of natural deposits

Combined Radium (pCi/L)

0

5

<0.9

N/A

N

01/14/2015

Erosion of natural deposits

Fluoride (ppm)

4

 

4

0.88

NA

N

12/20/2016

Water additive which promotes strong teeth

Barium (ppm)

2

 

2

0.017

NA

N

5/10/2016

Discharge of drilling wastes;

Discharge from metal refineries;

Erosion of natural deposits

Turbidity (NTU)

NA

TT, 1 NTU max

0.45

NA

N

6/25/2016

Soil run-off

TT, 0.3 NTU 95% of the time

 

99.9%

 

NA

 

1/7/2016

 

 

Chlorine (ppm)

MRDLG= 4

MRDL

= 4

1.17

0.42-1.87

N

2016

Water additive used to control microbes

Haloacetic Acids (ppb)

NA

60

32

6-32

N

10/11/2016

By-product of water disinfection

Total Trihalomethane (ppb)

NA

80

55

10-55

N

10/11/16

By-product of water disinfection

Total Organic Carbon Removal Ratio

NA

TT In compliance if > or = 1.0

1.00

1.00-1.69

N

2016

Naturally present in the environment

 

Lead and Copper Contaminants

Contaminant  (units)

MCLG

Action Level

90th Percentile

Level Detected

# of Sites Exceeding Action Level

Date of Sample

Typical Source of Contamination

Copper (ppm)

0

1.3

0.015

0

9/26/2016

Corrosion of household plumbing systems; erosion of natural deposits

Lead (ppb)

0

15

2.00

0

9/26/2016

Corrosion of household plumbing systems; erosion of natural deposits

 

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 Big Stone Gap Water Treatment Plant 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 (800-426-4791) or at http://www.epa.gov/safewater/lead.

 

 

VIOLATION INFORMATION

 

The Town of Big Stone Gap had no violations of maximum contaminant levels(MCL) or treatment techniques(TT).

 

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. The water quality results in this report are from testing done in 2016.  Some constituents are analyzed multiple times each day at the water plant. For example, the water plant staff analyzed the filter effluent turbidity almost 16,000 times in 2016. Others, which do not vary or are not routinely detected, are sampled annually. The state allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently.  Water from the Big Stone Gap water treatment and distribution system is regularly analyzed for about one hundred different water quality parameters to insure your safety. We check for organics, inorganics, metals, radiological, pesticides, herbicides, and other constituents. In this report, data is from samples collected in 2016 and we have included only constituents which were detectable by laboratory analysis. Some of our data, though accurate, is more than one year old.