Current through Register Vol. 50, No. 9, September 20, 2024
A.
Detailed plans and specifications for which a fluoridation permit is requested
shall be submitted in duplicate, to the Department of Health and Hospitals
Office of Public Health's (DHH-OPH) District engineer and the DHH-OPH's
fluoridation engineer by the responsible person of the water supply system.
Such plans and specifications shall be submitted prior to
construction.
B. The following
provides minimum requirements as well as additional information to assist in
the application for a fluoridation permit and in the preparation of plans and
specifications. The review and approval of plans and specifications submitted
for the issuance of a permit, shall be made in accordance with the "Recommended
Standards for Water Works, 2003 Edition" (aka the "Ten State Standards") plus
any additional requirements as set forth in this Subpart. Additional
fluoride-related documents which may be used by a community water system as
guidance/information purposes may be found in the CDC's Morbidity and Mortality
Weekly Report (MMWR) titled "Engineering and Administrative Recommendations for
Water Fluoridation, 1995", as amended, and in the American Water Works
Association (AWWA) "Water Fluoridation Principles and Practices M4, Fifth
Edition", as amended.
1. Three general types
of fluoride compounds are approved for fluoridation of water supplies; namely,
sodium fluoride, sodium fluorosilicate and fluorosilicic acid. Each has certain
advantages and disadvantages, and the type chosen will depend on the
characteristics of the water to be treated and the capacity of the
supply.
2. The fluoride source
material to be used must conform to NSF International/American National
Standards Institute (NSF/ANSI) Standard 60-2009 and the applicable AWWA
specification, as follows:
a. for sodium
fluoride, AWWA Standard B701-99;
b.
for sodium fluorosilicate, AWWA Standard B702-99; or
c. for fluorosilicic acid, AWWA Standard
B703-00.
3. The
fluoridation system shall only operate when a flow of water is detected. If the
water supply system serves less than two hundred service connections, a
secondary flow-based control device shall be provided as back-up
protection.
4. A means of measuring
the total amount of water treated daily and the amount of chemical injected
within the same time period must be provided. These measurements must be
accurate to within 5.0 percent.
5.
Fluorosilicic acid shall be stored in the original containers or containers
provided for the specific purpose, apart from the other chemicals used in the
water treatment process. Bulk storage tanks shall be in secondary containment
per LAC 33:IX.Chapter 9.
6. When
bulk storage of fluorosilicic acid is provided, a day tank shall be provided.
The day tank shall hold no more than a 30 hour supply, as calculated at maximum
feed rate. The day tank should be scale mounted, preferably under shelter. If
scales are not used, level indication can be used for the calculation of the
amount of chemical used provided it is accurate within five percent. Filling of
day tanks shall not be automated.
7. A diaphragm-type anti-siphon device shall
be installed in the fluoride feed line when a metering pump is used and shall
be located at the fluoride injection point. A second diaphragm-type anti-siphon
device should be installed immediately downstream of the metering pump's
discharge head. These anti-siphon devices shall have a diaphragm that is
spring-loaded in the closed position.
8. The following safety equipment shall be
required for operators handling the following fluoride compounds:
a. fluorosilicic acid: gauntlet neoprene
gloves, a minimum of 12 inches long with cuffs; full face shield and
splash-proof safety goggles; and a heavy-duty, acid-proof neoprene
apron;
b. sodium fluoride or sodium
fluorosilicate: the same safety equipment required under Subparagraph 8.a. of
this Subsection for fluorosilicic acid with the exception that the full face
shield shall be replaced by a National Institute for Occupational Safety and
Health/Mine Safety and Health Administration (NIOSH/MSHA) approved, N-series
respirator;
c. for dry chemical
systems, an eye wash station should be available and easily accessible;
and
d. for acid systems, an eye
wash station shall be available along with a safety shower and both shall be
easily accessible and connected to an approved potable water supply.
AUTHORITY NOTE:
Promulgated in accordance with 45 CFR, Parts 16, 74 and 96; P.L. 97-35, Section
901;
42 USC 2476;
and R.S. 40:5.11(G).
