(A) A public water system well shall be
disinfected after completion of construction, installation, development,
alteration or repair, or any other actvity or event
that might lead to the contamination of the water, and before supplying
water for human consumption.
(B)
The standard "AWWA C654C654-13,
"Disinfection of Wells," shall be used as a guide
except for the topics presented in sections 4.2, 4.5 and 5, that are otherwise
specified in paragraphs (C), (D) and (E) of this rule.
(C) The following disinfection procedures
shall apply:
(1) Disinfectant shall be slowly
poured into the well by wetting the inside casing circumference, drop pipe and
electrical cable.
(2) Disinfectant
concentration in the water column shall be initially at least one hundred
milligrams per liter chlorine. A public water system may use an alternative
disinfectant concentration following consultation with the office staff of the
district in which the public water system is located, provided the disinfection
procedure will ensure complete disinfection and includes the following:
(a) A mechanical cleaning of the well casing
and screen to remove loose debris, sediment, mineral encrustation and bacterial
slime before disinfection.
(b)
Monitoring of the pH and chlorine residual.
(c) Maintaining at least fifty milligrams per
liter free chlorine residual throughout the water column.
(3) Water in the well shall be agitated or
surged to ensure even dispersal of the disinfectant throughout the entire water
column.
(4) Disinfectant contact
time shall be at least eight hours.
(5) Disinfectant shall be thoroughly flushed
or dissipated from the well before supplying water for human
consumption.
(6) When calcium
hypochlorite is used for disinfection, the tablets or granules shall be
completely dissolved in water prior to placement into the well. Sodium
hypochlorite solution shall be used within the manufacturer's posted expiration
date. Sodium hypochlorite solution with fragrance additives shall not be used
for disinfection.
(7) A buffering
chemical that has standard ANSI/NSF 60 certification may be used to enhance
disinfection efficacy. The director may require submission of chemical
disinfection procedures with specifications for the method, equipment,
chemicals and testing for residual chemicals.
(8) Disinfectant shall have ANSI/NSF 60
certification.
(D) After
disinfection, a well shall be flushed for a minimum of fifteen minutes and
total chlorine undetectable before sampling for total coliform. The well
shall not be placed into service until
may be placed into service when two
consecutive samples collected from the well at least thirty minutes apart are
total coliform-negative. Microbiological and total chlorine samples shall be
analyzed in accordance with Chapter 3745-89 and rule
3745-81-27 of the Administrative
Code.
(E) If a sample is reported
positive for total coliform, a system shall do one of the following:
(1) Continue to flush the well and collect
total coliform samples to achieve compliance with paragraph (D) of this
rule.
(2) Repeat the well
chlorination procedures as described in paragraph (C) of this rule if necessary
to achieve compliance with paragraph (D) of this rule.
(F) A system with a well unable to meet
paragraph (D) of this rule after the second chlorination must consult with the
director for corrective action, which may include compliance with paragraph (B)
of rule
3745-81-42 of the Administrative
Code.
[Comment: "Standard ANSI/NSF 60,
Drinking Water Treatment Chemicals - Health Effects, December 11, 2009,
Document Number NSF/ANSI 60-2009a." This rule incorporates this standard or
specification by reference. A copy may be obtained from "NSF International, 789
N. Dixboro Road, P.O. Box 130140, Ann Arbor, MI 48105," (734) 769-8010,
www.nsf.org. This standard is available for review at "Ohio EPA, Lazarus
Government Center, 50 West Town Street, Suite 700, Columbus, OH,
43215."]
[Comment: "Standard AWWA C654-13,
Disinfection of Wells," effective date July 1, 2013. This rule incorporates
this standard or specification by reference. A copy may be obtained from "AWWA
Bookstore, 6666 W. Quincy Avenue, Denver, CO, 80235," (303) 794-7711,
www.awwa.org. This standard is available for review at "Ohio EPA, Lazarus
Government Center, 50 West Town Street, Suite 700, Columbus, OH
43215."]
[Comment: For dates of non-regulatory
government publications, publications of recognized organizations and
associations, test methods, federal rules, and federal statutory provisions
referenced in this rule, see paragraph (AA) of rule
3745-9-01 of the Administrative
Code titled "Incorporation by reference."]
