Current through Bulletin 2024-18, September 15, 2024
All routine operation and maintenance of public water
supplies shall be carried out with due regard for public health and safety. The
following sections describe procedures which shall be used in carrying out some
common operation and maintenance procedures.
(1) Chemical Addition
(a) Water system operators shall determine
that all chemicals added to water intended for human consumption are suitable
for potable water use and comply with ANSI/NSF Standard 60.
(b) No chemicals or other substances shall be
added to public water supplies unless the chemical addition facilities and
chemical type have been reviewed and approved by the Director.
(c) Chlorine, when used in the distribution
system, shall be added in sufficient quantity to achieve either "breakpoint"
and yield a detectable free chlorine residual or a detectable combined chlorine
residual in the distribution system at points to be determined by the Director.
Residual checks shall be taken a minimum of three times each week by the
operator of any system using disinfectants. The Director may, however, reduce
the frequency of residual checks if he determines that this would be an
unwarranted hardship on the water system operator and, furthermore, the
disinfection equipment has a verified record of reliable operation. Suppliers,
when checking for residuals, shall use test kits and methods which meet the
requirements of the U.S. EPA. The "DPD" test method is recommended for free
chlorine residuals. Information on the suppliers of this equipment is available
from the Division of Drinking Water.
(2) New and Repaired Mains
(a) All new water mains shall meet the
requirements of
R309-550-6 with regard to materials of construction. All products in contact with culinary
water shall comply with ANSI/NSF Standard 61.
(b) All new and repaired water mains or
appurtenances shall be disinfected in accordance with AWWA Standard C651-92.
The chlorine solution shall be flushed from the water main with potable water
prior to the main being placed in use.
(c) All products used to recoat the interiors
of storage structures and which may come in contact with culinary water shall
comply with ANSI/NSF Standard 61.
(3) Reservoir Maintenance and Disinfection
After a reservoir has been entered for maintenance or
re-coating, it shall be disinfected prior to being placed into service.
Procedures given in AWWA Standard C651-92 shall be followed in this
regard.
(4) Spring
Collection Area Maintenance
(a) Spring
collection areas shall be periodically cleared of deep rooted vegetation to
prevent root growth from clogging collection lines. Frequent hand or mechanical
clearing of spring collection areas is strongly recommended. It is advantageous
to encourage the growth of grasses and other shallow rooted vegetation for
erosion control and to inhibit the growth of more detrimental flora.
(b) No pesticide (e.g., herbicide) may be
applied on a spring collection area without the prior written approval of the
Director. Such approval shall be given 1) only when acceptable pesticides are
proposed; 2) when the pesticide product manufacturer certifies that no harmful
substance will be imparted to the water; and 3) only when spring development
meets the requirements of these rules (see
R309-515-7).
(5) Security
All water system facilities such as spring junction boxes,
well houses, reservoirs, and treatment facilities shall be secure.
(6) Seasonal Operation
Water systems operated seasonally shall be disinfected and
flushed according to the techniques given in AWWA Standard C651-92 and C652-92
prior to each season's use. A satisfactory bacteriologic sample shall be
achieved prior to use. During the non-use period, care shall be taken to close
all openings into the system.
(7) Pump Lubricants
All oil lubricated pumps for culinary wells shall utilize
mineral oils suitable for human consumption as determined by the Director. To
assure proper performance, and to prevent the voiding of any warranties which
may be in force, the water supplier should confirm with individual pump
manufacturers that the oil which is selected will have the necessary properties
to perform satisfactorily.
