Current through Register Vol. 39, No. 6, September 16, 2024
The following water quality standards shall apply to
surface waters within water supply watersheds classified as WS-V. Water quality
standards applicable to Class C waters as described in Rule .0211 of this
Section shall also apply to Class WS-V waters.
(1) The best usage of waters classified as
WS-V shall be as waters that are protected as water supplies which are
generally upstream and draining to Class WS-IV waters; waters previously used
for drinking water supply purposes; or waters used by industry to supply their
employees, but not municipalities or counties, with a raw drinking water supply
source, although this type of use is not restricted to WS-V classification; and
all Class C uses.
(2) The best
usage of waters classified as WS-V shall be maintained as follows:
(a) Water quality standards in a WS-V water
shall meet the requirements as specified in Item (3) of this Rule.
(b) Wastewater and stormwater point source
discharges in a WS-V water shall meet the requirements as specified in Item (4)
of this Rule.
(c) Nonpoint source
pollution in a WS-V water shall meet the requirements as specified in Item (5)
of this Rule.
(d) Following
approved treatment, as defined in Rule .0202 of this Section, the waters shall
meet the Maximum Contaminant Level concentrations considered safe for drinking,
culinary, or food-processing purposes that are specified in 40 CFR Part 141
National Primary Drinking Water Regulations and in the North Carolina Rules
Governing Public Water Supplies,
15A NCAC
18C .1500.
(e) The Commission or its designee may apply
management requirements for the protection of waters downstream of receiving
waters provided in Rule .0203 of this Section.
(f) The Commission shall consider a more
protective classification for the water supply if a resolution requesting a
more protective classification is submitted from all local governments having
land use jurisdiction within the affected watershed.
(g) Sources of water pollution that preclude
any of the best uses on either a short-term or long-term basis shall be deemed
to violate a water quality standard;
(3) Water quality standards applicable to
Class WS-V Waters shall be as follows:
(a)
MBAS (Methylene-Blue Active Substances): not greater than 0.5 mg/l to protect
the aesthetic qualities of water supplies and to prevent foaming;
(b) Odor producing substances contained in
sewage, industrial wastes, or other wastes: only such amounts, whether alone or
in combination with other substances or waste, as will not cause organoleptic
effects in water supplies that can not be corrected by treatment, impair the
palatability of fish, or have an adverse impact, as defined in
15A NCAC
02H .1002, on any best usage established for
waters of this class;
(c)
Chlorinated phenolic compounds: not greater than 1.0 ug/l to protect water
supplies from taste and odor problems due to chlorinated phenols. Specific
phenolic compounds may be given a different limit if it is demonstrated not to
cause taste and odor problems and not to be detrimental to other best
usage;
(d) Total hardness: not
greater than 100 mg/l as calcium carbonate (CaCO3 or Ca
+ Mg);
(e) Solids, total dissolved:
not greater than 500 mg/l;
(f)
Toxic and other deleterious substances that are non-carcinogens:
(i) Barium: 1.0 mg/l;
(ii) Chloride: 250 mg/l;
(iii) Nickel: 25 ug/l;
(iv) Nitrate nitrogen: 10.0 mg/l;
(v) 2,4-D: 70 ug/l;
(vi) 2,4,5-TP (Silvex): 10 ug/l;
and
(vii) Sulfates: 250
mg/l;
(g) Toxic and
other deleterious substances that are carcinogens:
(i) Aldrin: 0.05 ng/1;
(ii) Arsenic: 10 ug/l;
(iii) Benzene: 1.19 ug/1;
(iv) Carbon tetrachloride: 0.254
ug/l;
(v) Chlordane: 0.8
ng/1;
(vi) Chlorinated benzenes:
488 ug/l;
(vii) DDT: 0.2
ng/1;
(viii) Dieldrin: 0.05
ng/1;
(ix) Dioxin: 0.000005
ng/l;
(x) Heptachlor: 0.08
ng/1;
(xi) Hexachlorobutadiene:
0.44 ug/l;
(xii) Polynuclear
aromatic hydrocarbons (total of all PAHs): 2.8 ng/l;
(xiii) Tetrachloroethane (1,1,2,2): 0.17
ug/l;
(xiv) Tetrachloroethylene:
0.7 ug/l;
(xv) Trichloroethylene:
2.5 ug/l; and
(xvi) Vinyl Chloride:
0.025 ug/l.
(4) No discharge of sewage, industrial
wastes, or other wastes shall be allowed that have an adverse effect on human
health or that are not treated in accordance with the permit or other
requirements established by the Division pursuant to
G.S.
143-215.1. Upon request by the Commission,
dischargers or industrial users subject to pretreatment standards shall
disclose all chemical constituents present or potentially present in their
wastes and chemicals that could be spilled or be present in runoff from their
facility which may have an adverse impact on downstream water quality. These
facilities may be required to have spill and treatment failure control plans as
well as perform special monitoring for toxic substances.
(5) Nonpoint Source pollution in a WS-V water
shall not have an adverse impact on waters for use as water supply or any other
designated use.
Authority
G.S.
143-214.1;
143-215.3(a)(1);
Eff. October 1, 1989;
Amended Eff. January 1, 2015; May 1, 2007;
April 1, 2003; October 1, 1995;
Readopted Eff. November 1,
2019.
