2006 Annual Drinking Water Quality Report

2006 Annual Drinking Water Quality Report

TOWN OF BLOWING ROCK

PWS ID#01-95-020

We are pleased to present to you this year’s Annual Drinking Water Quality Report. This report is a snapshot of last year’s water quality. Included are details about from where your water comes, what it contains, and how it compares to standards set by regulatory agencies. Our constant goal is to provide you with a safe a dependable supply of drinking water. We want you to understand the efforts we make to continually improve the water treatment process and protect our water resources. We are committed to ensuring the quality of your water and to providing you with this information, because informed customers are our best allies.

What EPA Wants You to Know

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. Immunocompromised 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 infection. 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 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 form 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 storm water 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 storm water runoff, and residential uses; organic chemical contaminants, including synthetic an volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems; and 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.

When You Turn on Your Tap, Consider the Source

The water that is used by this system is surface water. Our water is drawn from the town reservoir, which is located on land that is leased from the Park Service. The water is treated at the Town of Blowing Rock Water Treatment Facility.

Source Water Assessment Program (SWAP) Results

The North Carolina Department of Environment and Natural Resources (DENR), Public Water Supply (PWS) Section, Source Water Assessment Program (SWAP) conducted assessments for all drinking water sources across North Carolina. The purpose of the assessments was to determine the susceptibility of each drinking water source (well or surface water intake) to Potential Contaminant Source (PCSs). The results of the assessment are available in SWAP Assessment Reports that include maps, background information and a relative susceptibility rating of Higher, Moderate or Lower. The relative susceptibility rating of each source for the Town of Blowing Rock was determined by combining the contaminant rating (number and location of PCSs within the assessment area) and the inherent vulnerability rating(i.e., characteristics or existing conditions of the well or watershed and it delineated assessment area). The assessment findings are summarized in the table below:

Susceptibility of Sources to Potential Contaminant Sources (PCSs)

Source Name	Susceptibility Rating	SWAP Report Date
Town Lake	Moderate	February 22, 2007

The complete SWAP Assessment report for the Town of Blowing Rock may be viewed on the web at: http://www.deh.enr.state.nc.us/pws/swap. Please note that because SWAP results and reports are periodically updated by the PWS Section, the results available on this web site may differ from the results that were available at the time this CCR was prepared. To obtain a printed copy of this report, please mail a written request to: Source Water Assessment Program – Report Request, 1634 Mail Service Center, Raleigh NC 27699-1634, or email request to swap@ncmail.net. Please indicate your system name, PWSID, and provide your name, mailing address and phone number. IF you have any questions about the SWAP report please contact the Source Water Assessment staff by phone at 919-715-2633. It is important to understand that a susceptibility rating of “higher” does not imply poor water quality, only the systems’ potential to become contaminated by PCS’s in the assessment area.

Violations That Your Water System Received for the Report Year

During 2006, or during any compliance period that ended in 2006, we received no violations.

What if I Have Any Questions of Would Like to Become More Involved

If you have any questions about this report or concerning your water, please contact Tom McRary at 828-295-5225. We want our valued customers to be informed about their water utility. If you want to learn more, please attend any of our regularly scheduled meetings. They are held on the second Tuesday of each month at 7:00 p.m. at the Town Hall.

Water Quality Data Table of Detected Contaminants

We routinely monitor for over 150 contaminants in your drinking water according to Federal and State laws. The table below lists all the drinking water contaminants that we detected in the last round of sampling for the particular contaminant group. The presence of contaminants does not necessarily indicate that water poses a health risk. Unless otherwise noted, the data presented in this table is from testing done January 1 through December 31, 2006. The EPA or 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.

Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulating is warranted.

Important Drinking Water Definitions:

Not-Applicable (N/A) – Information not applicable/not required for that particular water system or for that particular rule.

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 (ug/L) – 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 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 (AL) – The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.

Treatment Technique (TT) – A treatment technique is a required process intended to reduce the level of a contaminant in drinking water.

Maximum Residual Disinfection Level Goal (MRDLg) – The level of a 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 Disinfection 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.

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.

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.

Extra Note: MCLs are set at very stringent levels. To understand the possible health effects described for many regulated constituents, a person would have to drink 2 liters of water ever day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect.

Turbidity*

Contaminant (units)

MCL

Violation

Y/N

Your

Water

MCLG

MCL

Likely source of Contamination

Turbidity (NTU)

0.28

N/A

TT= 1 NTU

Soil runoff

100%

TT= percentage of samples ≤ 0.3 NTU

* Turbidity is a measure of the cloudiness of the water. We monitor it because it is a good indicator of the effectiveness of our filtration system. Beginning January 2005, the turbidity rule will require, for all systems, that 95% or more of the monthly samples must be less than or equal to 0.3 NTU.

Inorganic Contaminants

Contaminant

(units)

Sample

Date

MCL

Violation

Y/N

Your

Water

Range

Low High

MCLG

MCL

Likely source of Contamination

Fluoride (ppm)

8/8/06

0.766

N/A

Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories

Unregulated Inorganic Contaminants

Contaminant
(units)

Sample
Date

Your
Water

Range

Low High

Secondary
MCL

Sulfate (ppm)

8/8/06

12.1

N/A

250

Unregulated VOC

Contaminant
(units)

Sample
Date

Your
Water

Range

Low High

Chloroform (ppb)

2/14/06

15.9

N/A

Bromodichloromethane
(ppb)

2/14/06

1.7

N/A

Lead and Copper Contaminants

Contaminant (units)

Sample

Date

Your

Water

# of Sites Found Above the AL

MCLG

MCL

Likely source of contamination

Copper (ppm)

(90^th percentile)

July

2006

0.083

1.3

AL = 1.3

Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives

Lead (ppb)

(90^th percentile)

July

2006

< 3.0

AL = 15

Corrosion of household plumbing systems, erosion of natural deposits

Radioactive Contaminants

Contaminant (units)

Sample

Date

MCL

Violation

Y/N

Your

Water

MCLG

MCL

Likely Source of Contamination

Alpha emitters (pCi/L)

10/9/03

5.9

Erosion of natural deposits

Combined radium (pCi/L)

10/9/03

1.5

Erosion of natural deposits

Disinfection Byproduct Precursors Contaminants

Contaminant (units)

Sample
Date

MCL/TT

Violation

Y/N

Your

Water

Range

Low High

MCLG

MCL

Likely Source of Contamination

Total Organic Carbon (ppm)
(TOC) - RAW

Monthly

3.33

2.2 4.7

N/A

Naturally present in the environment

Total Organic Carbon (ppm)

(TOC) – TREATED

Monthly

1.47

0.8 2.8

N/A

Naturally present in the environment

Note: Depending on the TOC in our source water, the system MUST have a certain% removal of TOC or must achieve alternative compliance criteria. If we do not achieve that % removal, there is an alternative % removal. If we fail to meet the alternative % removal, we are in violation of a Treatment Technique

Our water system used Alt. 1 of the Alternate Compliance Criteria as the method to comply with the disinfectants/disinfection byproducts treatment technique requirements.

Alternative Compliance Criteria (ACC)
Alt. 1	Source Water TOC < 2.0 mg/L
Alt. 2	Treated Water TOC < 2.0 mg/L
Alt. 3	Source Water SUVA ≤ 2.0 L/mg-m
Alt. 4	Treated Water SUVA ≤ 2.0 L/mg-m
Alt. 5	Treated Water Alkalinity < 60 mg/L (for softening systems only)
Alt 6	THM & HAA RAA’s ≤ ½ MCL & uses only chlorine
Alt. 7	Source TOC RAA < 4.0 mg/L and Source Alkalinity > 60 mg/L and THM & HAA RAA’s ≤ ½ MCL

Disinfectants and Disinfection Byproducts Contaminants

Contaminant (units)

MCL/MRDL

Violation

Y/N

Your

Water

(AVG)

Range

Low High

MCLG

MCL

Likely Source of Contamination

TTHM (ppb)

[Total Trihalomethanes]

21.25

10 39

N/A

By-product of drinking water chlorination

HAA5 (ppb)

[Total Haloacetic Acids]

30.00

25 36

N/A

By-product of drinking water disinfection

Secondary Contaminants, required by the NC Public Water Supply Section, are substances that affect the taste, odor, and/or color of drinking water. These aesthetic contaminants normally do not have any health effects and normally do not affect the safety of your water.

Water Characteristics Contaminants

Contaminant (units)	Sample Date	Your Water	Range Low High	Secondary MCL
Manganese (ppm)	8/8/06	0.011	N/A	0.05
Sodium (ppm)	8/8/06	13.4	N/A	N/A
pH	8/8/06	7.11	N/A	6.5 to 8.5