Water Quality Report

Annual Drinking Water Quality Report

Town of Stanley

                                                                  

INTRODUCTION

 

This Annual Drinking Water Quality Report for calendar year 2011 is designed to provide you with valuable information about your drinking water quality. We are committed to providing 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 meets all state and federal requirements administered by the Virginia Department of Health (VDH).

 

If you have questions about this report, 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:

 

 

Mr.   Terry Pettit, Town Manager at (540) 778-2615

 

You can obtain additional information by attending Town Council meetings held at 7:30 p.m. the second Wednesday of each month in the Town Council Chambers.

 

GENERAL INFORMATION

 

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.  Substances (referred to as contaminants) in source water may come from septic systems, discharges from domestic or industrial wastewater treatment facilities, agricultural and farming activities, urban storm water runoff, residential uses, and many other types of activities.  Water from surface sources is treated to make it drinkable while groundwater may or may not have any treatment.

 

All 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. Immune-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. A/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). 

 

SOURCES AND TREATMENT OF YOUR DRINKING WATER

 

Your drinking water is groundwater obtained from five drilled wells. Water is distributed throughout the community by means of submersible well pumps, one elevated storage tank, one ground storage tank and variously sized distribution pipes.  No treatment is provided.

 

SOURCE WATER ASSESSMENTS

 

A source water assessment has been completed by the Virginia Department of Health (VDH).  The assessment determined that the wells serving our community may be susceptible to contamination because they are located in an area that promotes migration of contaminants from certain land use activities of concern. More specific information may be obtained by contacting the water system representative referenced within this report.

 

QUALITY OF YOUR DRINKING WATER

 

Your drinking water is routinely monitored according to Federal and State Regulations for a variety of contaminants.  The table on the next page shows the results of our monitoring for the period of January 1, 2011 to December 31, 2011.

 

Most of the results in the table are from testing done in 2011.  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.

 
DEFINITIONS

 

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:

 

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.

 

Nephelometric Turbidity Unit (NTU) – nephelometric turbidity unit is a measure of the clarity of water. Turbidity in excess of 5 NTU is just noticeable to the average person.

 

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.

 

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.

 

Variances and exemptions – state or A permission not to meet an MCL or a treatment technique under certain conditions

 

 Entry Point (EP) – place where water from the source or sources after application of any treatment is delivered to the distribution system.

 

WATER QUALITY RESULTS 

 

We constantly monitor for various contaminants in the water supply to meet all regulatory requirements. The tables list only those contaminants that had some level of detection.  Many other contaminants have been analyzed but were not present or were below the detection limits of the lab equipment. 

 

Maximum Contaminant Levels (MCL’s) are set at very stringent levels by the U.S. Environmental Protection Agency.  In developing the standards A assumes that the average adult drinks 2 liters of water each day throughout a 70-year life span.  A generally sets MCL’s 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.

 

 

Microbiological

 

Contaminant

MCLG

MCL

Level   Found

Unit

Measurement

Violation

Date   of Sample

Typical   Source of Contamination

 

Total Coliform

       Bacteria (1)

 

 

 

 

0

 

Presence of  Coliform bacteria in

> 1 sample per month

 

0

 

 

 

Presence or Absence

 

NO

 

 

 

Monthly

 

 

 

Naturally present in the environment

 

 

Inorganic Contaminants

 

Contaminant

MCLG

MCL

Level   Found

Unit

Measurement

Violation

Date   of Sample

Typical   Source of Contamination

 

Nitrates

 Well No. 1 EP

 Well No. 2 EP

 Well No. 3 EP

 Well No. 4 EP

 Well No. 6 EP

 

 

10

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

0.20

0.22

0.23

1.43

0.27

 

mg/l

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

07/11

 

 

 

 

 

 

 

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

 

 

 

 

 

 

Radiological Contaminants

 

Contaminant

MCLG

MCL

Level   Found

Unit

Measurement

Violation

Date   of Sample

Typical   Source of Contamination

 

Alpha   Emitters:

 Well No. 1 EP

 Well No. 2 EP

 Well No. 3 EP

 Well No. 4 EP

 Well No. 6 EP

 

Beta   Emitters:

 Well No. 1 EP

 Well No. 2 EP

 Well No. 3 EP

 Well No. 4 EP

 Well No. 6 EP

 

Combined   Radium:

 Well No. 1 EP

 Well No. 2 EP

 Well No. 3 EP

 Well No. 4 EP

 Well No. 6 EP

 

 

 

 

0

 

 

 

 

 

 

0

 

 

 

 

 

 

0

 

15

 

 

 

 

 

 

50

 

 

 

 

 

 

5

 

0.6

0.8

ND

1.4

1.1

 

4.3

3.4

2.8

2.7

3.6

 

ND

ND

1.0

1.1

ND

 

 

pCi/l

 

 

 

 

 

 

pCi/l

 

 

 

 

 

 

pCi/l

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

NO

 

 

 

 

 

 

NO

 

07/10

 

 

 

 

 

 

07/10

 

 

 

 

 

 

07/10

 

Erosion of natural deposits

 

 

 

 

 

 

Decay of natural or man-made deposits

 

 

 

 

 

Erosion of natural deposits

 

 

 

 

 

 

 

 

 

 

 

 

 

Lead and Copper (Most Recent Monitoring Period – July 2009)

 

Contaminant

MCLG

MCL

Level   Found

Unit

Measurement

AL  

Exceeded

Samples

>   AL

Typical   Source of Contamination

 

Lead

Copper

 

 

 

0

1.3

 

AL   = 15

AL   = 1.3

 

2.0

 0.124

 

ppb

mg/l

 

NO

NO

 

0

0

 

Corrosion of household plumbing   systems; Erosion of natural deposits

 

Lead Contaminants

 

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 Stanley is responsible for providing high quality drinking water, but cannot control the variety of materials used in the 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 the lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/safewater/lead.

 

VIOLATION INFORMATION

 

We were in full compliance with all water quality, monitoring and reporting requirements and no violations occurred during the calendar year 2011.

 

The waterworks owners prepared this Drinking Water Quality Report with the assistance and approval of the Virginia Department of Health (VDH).  Please call if you have questions.