North Carolina Administrative Code
Title 15A - Environmental Quality
Chapter 02 - ENVIRONMENTAL MANAGEMENT
Subchapter C - WELL CONSTRUCTION STANDARDS
Section .0100 - CRITERIA AND STANDARDS APPLICABLE TO WATER-SUPPLY AND
Section 02C .0111 - DISINFECTION OF WATER SUPPLY WELLS
Universal Citation: 15A NC Admin Code 02C .0111
Current through Register Vol. 39, No. 6, September 16, 2024
(a) Any person constructing, repairing, testing, or performing maintenance or installing a pump in a water supply well shall disinfect the well upon completion of construction, repairs, testing, maintenance, or pump installation.
(b) Any person disinfecting a well shall perform disinfection in accordance with the following procedures:
(1) Chlorination.
(A) Hypochlorite shall be placed in the well
in sufficient quantities to produce a chlorine residual of at least 100 parts
per million (ppm) in the well. Stabilized chlorine tablets or hypochlorite
products containing fungicides, algaecides, or other disinfectants shall not be
used. Chlorine test strips or other quantitative test methods shall be used to
confirm the concentration of the chlorine residual.
(B) The hypochlorite shall be placed in the
well by one of the following or equivalent methods:
(i) Granular hypochlorite may be dropped in
the top of the well and allowed to settle to the bottom; or
(ii) Hypochlorite solutions shall be placed
in the bottom of the well by using a bailer or by pouring the solution through
the drill rod, hose, or pipe placed in the bottom of the well. The solution
shall be flushed out of the drill rod, hose, or pipe by using water or
air.
(C) The water in
the well shall be agitated or circulated to ensure thorough dispersion of the
chlorine.
(D) The well casing, pump
column, and any other equipment above the water level in the well shall be
rinsed with the chlorine solution as a part of the disinfecting
process.
(E) The chlorine solution
shall stand in the well for a period of 24 hours or more.
(F) The well shall be pumped until there is
no detectable total chlorine residual in water pumped from the well before the
well is placed in use.
(2) Other alternate materials and methods of
disinfection, at least as effective as those set forth in Subparagraph (b)(1)
of this Rule, may be used upon prior approval by the Department. A written
request for approval of alternate disinfection methods or materials shall be
submitted to the Director and will be approved or denied on a case-by-case
basis following a review of the information submitted in this Subparagraph. The
written request shall include the following information:
(A) a demonstration that the method of
disinfection will be at least as effective as chlorination as described under
in Subparagraph (b)(1) of this Rule;
(B) a demonstration of non-toxicity, such as
ANSI or NSF Standard certification or EPA studies;
(C) the general procedures for the
disinfection and emplacement, including the amount of product to be used per
unit volume of the well;
(D) a
demonstration that, after disinfection is completed, the water within the well
will meet
15A NCAC
02L groundwater standards; and
(E) any other information requested by the
Department to ensure compliance with
G.S.
87-84.
Authority
G.S.
87-87;
87-88;
Eff. February
1, 1976;
Amended Eff. September 1, 2009; April 1, 2001; December 1,
1992; July 1, 1988; September 1, 1984;
Readopted Eff. September 1,
2019.
Disclaimer: These regulations may not be the most recent version. North Carolina may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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