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National Drinking Water Database


Cyanide in North Carolina


Cyanide is a chemical used in mining and steel/metal, plastic, and pesticide manufacturing; it is applied to roads as road salts, and small quantities occur naturally in some plants. [read more]

The Most Polluted Communities in North Carolina

20 water utilities reported detecting Cyanide in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Cyanide level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Wexford S/D
Raleigh, NC
1481 of 2130 ppb
(0 to 260 ppb)
2Rocky Pt/Topsail W & S Dist
Burgaw, NC
5,1301 of 170 ppb
(70 ppb)
3Town & Country Mhp NO 1
Wilmington, NC
751 of 150 ppb
(50 ppb)
4Figure 8 Island
Wilmington, NC
8742 of 348.33 ppb
(0 to 125 ppb)
5Hampstead Village Shopping Ctr
Hampstead, NC
501 of 240 ppb
(0 to 80 ppb)
6Greene Co Regional Water Syst
Walstonburg, NC
9,7021 of 630 ppb
(0 to 180 ppb)
7City of High Point
High Point, NC
96,8671 of 520 ppb
(0 to 100 ppb)
8Town of Topsail Beach
Topsail Beach, NC
3,1981 of 120 ppb
(20 ppb)
9Linville Land Harbor
Linville, NC
2,2801 of 914 ppb
(0 to 126 ppb)
10Town of Surf City
Surf City, NC
5,6061 of 412.5 ppb
(0 to 50 ppb)

Health Based Limits for Cyanide

StandardDescriptionLevel
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.80 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.140 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.150 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.200 ppb
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.200 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.200 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.200 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.200 ppb

Violation Summary for Cyanide in North Carolina

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in North Carolina since 2004

Violation TypeNumber of Violations
Failure to monitor regularly103