Winston-Salem/Forsyth County Utilities drinking water meets all water quality standards
Winston-Salem/Forsyth County Utilities operates three water treatment facilities drawing water from both the Yadkin River and Salem Lake. Together, these water treatment facilities can produce up to 91 million gallons of drinking water per day. The Neilson and Swann Water Treatment Plants can treat 48 and 25 million gallons per day, respectively, from the Yadkin River. The Thomas Water Treatment Plant can treat 18 million gallons per day from Salem Lake and the Yadkin River.
For 2020, as in previous years, these treatment facilities have met or surpassed all state and federal standards for drinking water quality. This accomplishment reflects the quality and dedication of the employees who work year-round to provide adequate supplies of safe drinking water.
This report includes details about the sources of your drinking water, how it is treated, what it contains and exactly how it compares to state and federal standards. We provide this updated information annually because we are committed to delivering top-quality drinking water to our customers.
In 1774, the Moravians of Salem began work on one of the nation’s first water systems. Water was delivered through bored-out logs joined end-to-end, a design praised by President Washington during his 1791 visit.
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Protecting Our Water Sources
Sources of both tap and bottled drinking water include rivers, lakes, 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. Water can also 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 wastewater treatment plants, septic systems, agricultural livestock operations and wildlife.
• Inorganic contaminants, such as salts and metals, which can occur naturally or result from urban storm water runoff, industrial or wastewater discharges, oil and gas productions, 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 and volatile organic chemicals, which are by-products of industrial processes and petroleum production and can come from gas stations, urban storm water runoff and septic systems.
• Radioactive contaminants which can occur naturally or as a result of oil and gas production and mining activities.
To ensure that tap water is safe to drink, the Environmental Protection Agency limits 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 the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the EPA’s Safe Drinking Water Hotline at 800-426-4791.
North Carolina Source Water Assessment
The North Carolina Department of Environmental Quality (DEQ), 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 Sources (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 City of Winston-Salem (PWSID 0234010) 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 its delineated assessment area). The assessment findings are summarized in the table below:
Source Water Assessment Program Results Summary
SOURCE NAME
INHERENT VULNERABILITY RATING
CONTAMINANT RATING
SUSCEPTIBILITY RATING
Salem Lake
Moderate
Higher
Higher
Yadkin River (Idols Dam)
Higher
Moderate
Higher
Yadkin River (PW Swann Water Treatment Plant)
Higher
Lower
Moderate
Table 2 of SWAP Report for Winston-Salem
It is important to understand that a susceptibility rating of “higher” does not imply poor water quality, only the system’s potential to become contaminated by PCSs in the assessment area.
The complete SWAP Assessment report for the City of Winston-Salem may be viewed on the Web at: ncwater.org/?page=600. Please indicate your system name (Winston-Salem, City of) and number (0234010). 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 report was prepared.
If you are unable to access your SWAP report on the web, you may mail a written request for a printed copy to: Source Water Assessment Program - Report Request 1634 Mail Service Center Raleigh, NC 27699-1634 or email requests to swap@ncdenr.gov. Please indicate your system name (Winston-Salem, City of), number (0234010), 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 919-707-9098.
Treated Water Quality
The following substances were detected in Winston-Salem/Forsyth County Utilities public water supply during the 2020 calendar year.
Regulated at the Treatment Plant
Substance
Highest Level Allowed (EPA MCL1)
Ideal Goals (EPA MCLG2)
RANGe of Detection
Average Level DEtected
Source
Barium, ppb4
2000
2000
13.0 - 21.0
16.0
Natural geology; drilling operations; metal refinery wastes
Fluoride ppm5
4.06
4.0
0.01 - 1.01
0.79
Erosion of natural deposits; Water additive, promotes strong teeth
Orthophosphate, ppm
N/A
0.50 - 5.0012
0.37 - 1.01
0.86
Water treatment additive to prevent pipe corrosion
Total Organic Carbon, ppm
Treatment Technique7
N/A
0.79 - 1.53
1.03
Naturally present in the environment
Turbidity, NTU8
Treatment Technique9
N/A
0.02 - 0.35
0.05
Soil erosion
Regulated in the Distribution System
SUBSTANCE
HIGHEST LEVEL ALLOWED (EPA MCL1)
IDEAL GOALS (EPA MCLG2)
Range of dEtection
Average LEvel DEtected
Source
Total Trihalomethanes, ppb
80 LRAA10
0.0
18.2 - 98.8
53.4
Byproducts of drinking water disinfection
Total Haloacetic Acids (5), ppb
60 LRAA10
0.0
16.4 - 54.8
32.2
Byproducts of drinking water disinfection
Chlorine, ppm
4.0
4.0
0.04 - 1.86
0.97
Water treatment additive for disinfection
Total Coliforms
Less than 5% positive
0.0
ND - 0.54%11
0.05%
Naturally present in the environment
Unregulated Substances at the Treatment Plant - Point of Entry
SUbstance
IDEAL GOALS (EPA MCLG2)
RANGe of Detection
AVERAGE LEVEL DETECTED
Source
Geosmin, ppt3
Not Regulated
ND - 7.1
3.1
Byproduct of algae growth13
2-methylisoborneol, ppt
Not Regulated
ND - 5.8
1.6
Byproduct of algae growth
Unregulated Substances at the Treatment Plant - Source Water
SUBSTANCE
IDEAL GOALS (EPA MCLG2)
RANGE OF DETECTION
AVERAGE LEVEL DETECTED
SOURCE
Geosmin, ppt
Not Regulated
ND - 7.7
2.8
Byproduct of algae growth
2-methylisoborneol, ppt
Not Regulated
ND - 40.4
8.1
Byproduct of algae growth
DEFINITIONS:
1 Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water.
2 Maximum Contaminant Level Goal (MCLG) - The level of a contaminant in drinking water below which there is no known or expected risk to health.
3 ppt - One part per trillion. - (For example, one penny in $10,000,000,000.)
4 ppb - One part per billion. - (For example, one penny in $10,000,000.)
5 ppm - One part per million. - (For example, one penny in $10,000.)
6 The EPA’s maximum contaminant level for fluoride is 4.0 mg/L, however the State of North Carolina has established a maximum contaminant level of 2.0 mg/L.
7 Treatment technique - Treatment technique for total organic carbon was complied throughout 2019.
8 NTU - nephelometric turbidity unit, a measure of the cloudiness of water.
9 Treatment technique - 95% of the measurements taken in one month must be below 0.3 NTU. Turbidity treatment technique was complied with throughout 2020.
10 Locational running annual average - average of last four quarters of samples collected at each location at 12 monitoring sites.
11 1 TC positive sample out of 185 in August 2020 = 0.54%
12 A corrosion study was conducted that determined the ideal orthophosphate range for reducing lead and copper corrosion in our system was between 0.50 - 5.00 ppm.
13 These compounds are created by algae in raw water that can cause an earthy/musty taste or odor in drinking water. While some people may find this unpleasant, there are no known negative health impacts associated with their consumption.
ND = not detected
Physical & Mineral Characteristics - Calendar Year 2020
Constituent
Annual Range Detected
Annual Average
Alkalinity, ppm
15.00 - 26.00
20.60
Aluminum, ppm
0.006 - 0.027
0.011
Calcium, ppm
3.21 - 4.58
3.90
Carbon Dioxide, ppm
1.00 - 9.50
3.40
Chlorine, ppm
0.75 - 1.82
1.42
Conductivity, micromhos/cm
78.80 - 130.40
96.20
Copper, ppm
ND - 0.021
0.002
Hardness, ppm
10.0 - 26.0
17.6
Iron, ppm
ND - 0.011
<0.010
Lead, ppm
ND - 0.001
<0.001
Magnesium, ppm
1.17 - 1.72
1.42
Manganese, ppm
ND - 0.011
0.001
Nickel, ppm
ND - 0.001
<0.001
pH, Standard Units
6.80 - 8.30
7.50
Phosphate, ppm
0.68 - 1.04
0.86
Potassium, ppm
1.34 - 3.24
1.78
Silica, ppm
3.78 - 16.90
10.50
Sodium, ppm
7.94 - 16.40
10.20
Zinc, ppm
0.173 - 0.273
0.215
ND = not detected
Cryptosporidium sp. This is a microscopic organism that, when ingested, can cause diarrhea, fever and other gastrointestinal symptoms. The organism occurs naturally in surface waters (lakes & streams) and comes from animal waste. Cryptosporidium sp. is eliminated by an effective treatment combination of coagulation, sedimentation, filtration and disinfection.
We have completed two rounds of 24-month sampling at all of our water sources and have not detected any cryptosporidium. In addition, Cryptosporidium sp. has never been detected in our treated drinking water.
Special Concerns Some people may be more vulnerable to contaminants in drinking water than the general population. People whose immune systems have been compromised – such as people 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 for infections.
These people should seek advice about drinking water from their health care providers. Environmental Protection Agency and Centers for Disease Control guidelines on appropriate means to lessen risk of infection by Cryptosporidium sp. and other microbiological contaminants are available from the Safe Drinking Water Hotline at 800-426-4791.
En Español Si desea recibir una copia de este reporte en Español o si tiene preguntas con respecto a la calidad del agua que consume, por favor comuniquese con el departamento the servicios públicos durante las horas de trabajo, el teléfono es 336-727-8000 o visite cityofws.org/wqr2020espanol.
Lead Exposure from Water
Elevated levels of lead in drinking water can cause serious health problems, especially for pregnant women and young children. Lead in drinking water comes primarily from materials and components associated with service lines and home plumbing.
Winston-Salem/Forsyth County Utilities 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 by calling City Link 311 (336-727-8000). Information and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline at 800-426-4791 or epa.gov/ safewater/lead.
Regulated at the Consumers Tap - 2019 Compliance Samples
Substance
Highest Level Allowed (EPA MCL1)
Ideal Goals (EPA MCLG2)
Number of Sites Sampled
Number of Sites Above the Action Level
90th Percentile Concentration, ppb
Lead, ppb3
15.0 (action level4)
0.0
53
1
<3.0
Copper, ppb
1300.0 (action level)
1300.0
53
0
<50.0
Unregulated at the Consumers Tap - 2020 Customer Samples
SUBSTANCE
HIGHEST LEVEL ALLOWED (EPA MCL)
IDEAL GOALS (EPA MCLG)
NUMBER OF SITES SAMPLED
NUMBER OF SITES ABOVE THE ACTION LEVEL
90TH PERCENTILE CONCENTRATION, PPB
Lead, ppb
15.0 (action level)
0.0
17
0
<3.0
Copper, ppb
1300.0 (action level)
1300.0
17
0
<50.0
Source (both lead and copper): Corrosion of household plumbing; erosion of natural deposits
DEFINITIONS:
1 Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water.
2 Maximum Contaminant Level Goal (MCLG) - The level of a contaminant in drinking water below which there is no known or expected risk to health.
3 ppb - One part per billion. - (For example, one penny in $10,000,000.)
4 Action Level - The concentration of a contaminant that triggers treatment or other requirement that a water system must follow. Action levels are reported as the 90th percentile, which is the concentration that 90 percent of the locations sampled falls below. In 2019, our 90th percentile values were lead <3.0 and copper 0.56 ppb.
ND= not detected
Winston-Salem/Forsyth County Utilities is governed by the WSFC Utility Commission, which meets on the second Monday of each month. Meeting details at cityofws.org/utilitycommission. For questions about this report or the quality of our drinking water, call City Link 311 or 336-727-8000.
CITY OF WINSTON-SALEM Mayor: Allen Joines Denise D. Adams, Mayor Pro Tempore, North Ward Barbara Hanes Burke, Northeast Ward Robert C. Clark, West Ward John C. Larson, South Ward Jeff MacIntosh, Northwest Ward Kevin Mundy, Southwest Ward Annette Scippio, East Ward James Taylor, Jr., Southeast Ward City Manager: Lee D. Garrity
FORSYTH COUNTY BOARD OF COMMISSIONERS David R. Plyler, Chair Don Martin, Vice Chair Fleming El-Amin Ted Kaplan Richard V. Linville Tonya D. McDaniel Gloria D. Whisenhunt County Manager: Dudley Watts, Jr.
WSFC UTILITY COMMISSION Randall S. Tuttle, Chair L. Wesley Curtis, Jr., Vice Chair Harold E. Day Tom Griffin Yvonne H. Hines Duane Long Hugh W. Jernigan Chris Parker Donald R. Stewart Charles Wilson Allan Younger
Produced by Winston-Salem/Forsyth County Utilities P.O. Box 2511 Winston-Salem, N.C. 27102