Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS › Section 58.01.08.501 - FACILITY AND DESIGN STANDARDS: GENERAL DESIGN REQUIREMENTS FOR PUBLIC DRINKING WATER SYSTEMS

Current through August 31, 2023
Unless otherwise specified by the Department, the design of new
				drinking water systems, or modifications to existing, public drinking water
				systems, shall be in conformance with the facility and design standards set
				forth in Sections 006 and
				500 through
				552 of these rules. The following
				general design requirements shall apply as applicable for the type of water
				system and the treatment or other processes employed. (3-24-22)
01.
Materials Used in
			 Construction
. Products that are used to construct public drinking water
			 systems and have water contact surfaces shall conform to applicable AWWA
			 standards and be certified by an accredited ANSI certification body to meet
			 applicable ANSI/NSF standards, where products meeting such AWWA and ANSI/NSF
			 standards exist. In the absence of such products, products meeting applicable
			 product standards and acceptable to the reviewing authority may be selected.
			 Corrosion control shall be taken into account during all aspects of public
			 water system design. (3-24-22)
02.
Additives Used in Operation
. No chemical or other substance shall
			 be added to drinking water, nor shall any process be utilized to treat drinking
			 water, unless specifically approved by the Department. All chemicals shall
			 conform to applicable AWWA standards and be certified by an accredited ANSI
			 certification body to meet ANSI/NSF Standard 60, referenced in Subsection
			 002.02. (3-24-22)
03.
Design Basis
. The system,
			 including the water source and treatment facilities, shall be designed to
			 provide either peak hour demand of the system or maximum day demand plus
			 equalization storage at the design year. (3-24-22)
04.
Design of Treatment
			 Facilities
. Design of treatment facilities shall address: (3-24-22)
a. Functional aspects of facility layout and
			 provisions for future facility expansion; (3-24-22)
b. Provision for expansion of waste treatment
			 and disposal facilities (see Section
			 540) ; (3-24-22)
c. Roads constructed to provide year-round
			 access by vehicles and equipment needed for repair and maintenance;
			 (3-24-22)
d. Site grading and
			 drainage; and (3-24-22)
e. Chemical
			 Feed or Injection. Unless otherwise approved by the Department based on
			 documentation provided by the design engineer, all chemical feed or injection
			 systems must be designed to ensure complete mixing through rapid mix devices or
			 other measures. (3-24-22)
f.
			 Redundancy. Unless otherwise approved by the Department or as specified in
			 other sections of these rules, to ensure that minimum quality, quantity, and
			 pressure requirements of these rules are continuously met during maintenance,
			 breakdowns, structural failures, emergencies, or other periods when components
			 must be out of service, water system treatment, filtration, and disinfection
			 components for all new or substantially modified community or nontransient,
			 noncommunity drinking water systems shall be designed such that plant design
			 capacity can be maintained with any component out of service. Raw water intake
			 structures are excluded from the general redundancy requirement but shall be
			 designed to ensure that plant design capacity will be maintained.
			 (3-24-22)