Idaho Admin. Code r. 24.39.20.600 - IDAHO STATE PLUMBING CODE
Pursuant to Section 54-2601, Idaho Code, the Board adopts, as the Idaho State Plumbing Code (ISPC), the 2015 Uniform Plumbing Code, including Appendices A, B, C, D, E, G, I, J, K and L, with the following amendments: (3-28-23)
01.
Section 105.3
Testing of Systems. (3-28-23)
a. Delete
and replace the following: Plumbing systems must be tested and approved in
accordance with this code or the Authority Having Jurisdiction. Tests may be
conducted in the presence of the Authority Having Jurisdiction or the Authority
Having Jurisdiction's duly appointed representative. (3-28-23)
b. No test or inspection is required where a
plumbing system, or part thereof, is set up for exhibition purposes and has no
connection with a water or drainage system. In cases where it would be
impractical to provide the required water or air tests, or the presences of the
Authority Having Jurisdiction, or for minor installations and repairs, the
Authority Having Jurisdiction, in accordance with procedures established
thereby, is permitted to make such inspection as deemed advisable in accordance
with the intent of this code. Joints and connections in the plumbing system
must be gastight and watertight for the pressures required by the test.
(3-28-23)
02.
Section 218
Definitions. Delete definition of "Plumbing System." Incorporate
definition of "Plumbing System" as set forth in Section
54-2604, Idaho Code.
(3-28-23)
03.
Section
401.2 Qualities of
Fixture s. Replace with the following: Plumbing fixtures must be
constructed of dense, durable, non-absorbent materials and must have smooth,
impervious surfaces, free from unnecessary concealed fouling surfaces.
(3-28-23)
04.
Section
403.3 Exposed Pipes and
Surfaces. Delete. (3-28-23)
05.
Section
408.5 Finished Curb or
Threshold. Delete the last sentences of the first paragraph and replace
with the following: The finished floor of the receptor must slope uniformly
from the sides toward the drain not less than one-eighth (1/8) inch per foot
(20.8 mm/m), nor more than one-half (1/2) inch per foot (41.8 mm/m).
(3-28-23)
06.
Section
408.7.5 Tests for Shower
Receptors. Delete. (3-28-23)
07.
Section
409.4 Limitation of Hot Water in
Bathtubs and Whirlpool Bathtubs. Delete. (3-28-23)
08.
Table 501.1(1) First Hour
Rating. Delete Table 501.1(1). (3-28-23)
09.
Section
503.1 Inspection of Chimneys or
Vents. Add the following to the end of section
503.1: Water heating appliances
using Category 3 or 4 exhaust venting must be tested in its entirety with five
(5) pounds of air for fifteen (15) minutes. Plastic vents must be constructed
using manufacturer's instructions. (3-28-23)
10.
Section
507.2 Seismic Provisions.
Delete. (3-28-23)
11.
Section
507.13 Installation in
Garages. Replace 507.13 with the following: Any plumbing appliance or
appurtenance in residential garages and in adjacent spaces that open to the
garage and are not part of the living space of a dwelling unit must be
installed so that burners, burner-ignition devices or other sources of ignition
are located not less than eighteen (18) inches (450 mm) above the floor unless
listed as flammable vapor ignition resistant. (3-28-23)
12.
Section
603.2 Approval of Devices or
Assemblies. Delete last paragraph. (3-28-23)
13.
Table 603.2 Backflow Prevention
Devices, Assemblies and Methods. (3-28-23)
a. Delete from the table the entire row
related to freeze resistant sanitary yard hydrant devices. (3-28-23)
b. Delete the backflow preventer for
Carbonated Beverage Dispensers text from the first column of the table and
replace with the following: Backflow preventer for Carbonated Beverage
Dispensers (Reduced Pressure Principle Backflow Prevention Assembly).
(3-28-23)
14.
Section 603.4.2
Testing. Delete last sentence. (3-28-23)
15.
Section
603.5.7 Outlets with Hose
Attachments. Delete and replace with the following: Potable water
outlets with hose attachments, other than water heater drains, boiler drains,
freeze resistant yard hydrants and clothes washer connections, must be
protected by a nonremovable hose bibb-type backflow preventer, a nonremovable
hose bibb-type vacuum breaker, or by an atmospheric vacuum breaker installed
not less than six (6) inches (one hundred fifty-two (152) mm) above the highest
point of usage located on the discharge side of the last valve. In climates
where freezing temperatures occur, a listed self-draining frost-proof hose bibb
with an integral backflow preventer or vacuum breaker must be used.
(3-28-23)
16.
Section
603.5.12 Beverage
Dispensers. Delete and replace with the following: Potable water supply
to, carbonated beverage dispensers must be protected by an air gap or a Reduced
Pressure Principle Backflow Prevention Assembly in accordance with ASSE 1013.
For carbonated beverage dispensers, piping material installed downstream of the
backflow preventer must not be affected by carbon dioxide gas. Potable water
supply to beverage dispensers and coffee machines must be protected by an air
gap or a vented backflow preventer in accordance with ASSE 1022.
(3-28-23)
17.
Section
603.5.17 Potable Water Outlets
and Valves. Delete. (3-28-23)
18.
Section
603.5.21 Chemical
Dispensers. Add the following new section
603.5.21: The water supply to
chemical dispensers must be protected against backflow. The chemical dispenser
must comply with ASSE 1055 or the water supply must be protected by one of the
following methods: (3-28-23)
a. Air gap;
(3-28-23)
b. Atmospheric vacuum
breaker (AVB); (3-28-23)
c.
Pressure vacuum breaker backflow prevention assembly (PVB); (3-28-23)
d. Spill-resistant pressure vacuum breaker
(SVB); or (3-28-23)
e.
Reduced-pressure principle backflow prevention assembly (RP).
(3-28-23)
19.
Section 604.10.1
Tracer Wire. Add the following exception: Where the electrical wiring
for the pump is installed in the same trench as the water line, from the point
of origin to the structure, a tracer wire is not required. (3-28-23)
20.
Section
605.6.2 Mechanical
Joints. Add to the end of the section the following: Listed PE
(polyethylene), one hundred sixty (160) psi minimum, water service and yard
piping may be installed within a building (above ground and below ground) with
one (1) joint, provided that only listed and approved metallic transition
fittings must be used. Polyethylene (PE) plastic pipe or tubing and fitting
joining methods must be installed in accordance with the manufacturer's
installation instructions. (3-28-23)
21.
Section
609.1 Installation. Delete
the following sentence: Building supply yard piping must be not less than
twelve (12) inches (305 mm) below the average local frost depth; and replace it
with the following: The cover must be not less than forty-two (42) inches
(1068mm) below grade. (3-28-23)
22.
Section 609.4
Testing. Deleting the phrase "Except for plastic piping," at the
beginning of the third sentence and add the following sentence at the end of
the section: Plastic piping is to be tested in accordance with manufacturer's
installation standards. (3-28-23)
23.
Section
609.10 Water Hammer. Does
not apply to residential construction. (3-28-23)
24.
Section
609.11 Pipe Insulation.
Delete. (3-28-23)
25.
Table
610.3 and Appendix Table A 103.1. Change fixture unit loading value for
both public and private for bathtub or combination bath/shower, and clothes
washers to two (2) fixture units. (3-28-23)
26.
Section
610.2 Pressure Loss. Add
the following: All new one (1) and two (2) family residences built slab on
grade or that will have a finished basement at the time of final inspection
must have a pre-plumbed water softener loop. The kitchen sink must have one (1)
hot soft line and one (1) cold soft line and one (1) cold hard line. Exterior
cold hose bibbs intended for irrigation purposes must be piped with hard water.
(3-28-23)
27.
Table 611.4
Sizing of Residential Softeners. Amend Footnote 3 to read: Over four (4)
bathroom groups, softeners must be sized according to the manufacturer's
standards. (3-28-23)
28.
Section 612.0
Residential Sprinkler System. Add the following to the end of the first
sentence in section 612.1: and
the requirements of the Authority Having Jurisdiction (AHJ).
(3-28-23)
29.
Table 702.1
Drainage Fixture Unit Values (DFU). Change fixture unit loading value
for clothes washers, domestic for private to two (2) fixture units.
(3-28-23)
30.
Section
703.1 Minimum Size. Add
the following at the end of section
703.1: No portion of the drainage
or vent system installed underground, or underground under concrete must be
less than two (2) inches in diameter. (3-28-23)
31.
Section
704.2 Single Vertical Drainage
Pipe. Two inch (2") and smaller double sanitary tees may be used for
back to back or side by side fixture trap arms without increasing the barrel
size. (3-28-23)
32.
Section
704.3 Commercial Sinks.
Delete. (3-28-23)
33.
Table
703.2 Maximum Unit Loading and Maximum Length of Drainage and Vent
Piping. Change fixture unit loading value for one and a half (1 1/2)
inch horizontal drainage to two (2) fixture units. (3-28-23)
34.
Section
705.5.2 Solvent Cement
Joints. Add to the end of the section the following: PVC DWV may be
joined by the use of one-step solvent cement listed or labeled per U.P.C.
Section 301.1.1.
(3-28-23)
35.
Section
707.4 Locations. Add the
following: A clean out must be installed for double sanitary tees two (2)
inches (50 mm) or less in diameter that receive the discharge from fixture
connections. Exception in Section
707.4 does not apply. A
full-sized accessible cleanout must be installed in the vertical immediately
above the floor or at the base of each waste or soil stack. A full-size
cleanout extending to or above finished grade line must be installed at the
junction of the building drain and the building sewer. Cleanouts must be
installed at fifty (50) foot intervals in horizontal drain lines two (2) inches
or smaller. (3-28-23)
36.
Section 710.3(4)
Sewage Ejectors and Pumps. Add:
Exception (4): One (1) pump is permitted for "public use" occupancies provided
that such tank receives the discharge of not more than one (1) water closet and
ten (10) fixture units (See Section
710.9 Alarms).
(3-28-23)
37.
Section
710.5 Size Building Drains and
Sewers. Add the following exception: In single family dwellings, one (1)
fixture unit may be allowed for each gallon per minute of flow from a pump or a
sump ejector. (3-28-23)
38.
Section 712.1
Media. In the first sentence, delete the phrase "except that plastic
pipe must not be tested with air." (3-28-23)
39.
Section
717.0 Size of Building
Sewers. Add the following to the end of section
717.1: Exception: The building
drain and building sewer is not less than four (4) inches extending from its
connection with the city or private sewer system and must run full size to
inside the foundation or building lines. (3-28-23)
40.
Section
723.0 General. Delete the
following sentence: "Plastic DWV piping systems must not be tested by the air
test method." (3-28-23)
41.
Section 801.3.3
Food Handling Fixture s. Add: Food preparation sinks, pot sinks, scullery
sinks, dishwashing sinks, silverware sinks, commercial dishwashing machines,
silverware-washing machines, steam kettles, potato peelers, ice cream dipper
wells, and other similar equipment and fixtures must be indirectly connected to
the drainage system by means of an air gap. The piping from the equipment to
the receptor must not be smaller than the drain on the unit, but it must not be
smaller than one (1) inch (twenty-five and four tenths (25.4) mm).
(3-28-23)
42.
Section
805.41 General. Add to
the end of the first paragraph the following: Provisions must be made for the
discharge of the water softener to terminate in an approved location. The drain
line for a water softener must be three-fourths (3/4) inch minimum. A washer
box with a dual outlet is an approved location as long as it is on the same
floor or one (1) floor below the softener unit and the water softener drain
line is a minimum three-fourths (3/ 4) inch. (3-28-23)
43.
Section
807.3 Domestic Dishwashing
Machines. A domestic dishwashing machine may be installed without the
use of an airgap if the drain hose is looped to the bottom side of the
countertop and secured properly. (3-28-23)
44.
Section
906.1 Roof Termination.
Add the following: (3-28-23)
a. Sidewall
venting. When sidewall venting is utilized, the vent must extend flush with the
eaves/ gable end, turn down using a ninety (90) degree ell, and terminate as
close to the roof peak as possible. The vent end must be properly screened.
Sidewall venting is acceptable on new or remodel construction on cabins, log
homes, and residential or commercial buildings. (3-28-23)
45.
Section
908.1 Vertical Wet
Venting. Add to the end of the section the following: A horizontal wet
vent may be created provided it is created in a vertical position and all other
requirements of Section
908 of the ISPC are met.
(3-28-23)
46.
Section
909.0 Special Venting for Island
Fixture s. Add: Parameters for the limited use of Air Admittance Valves
(A.A.V.). (3-28-23)
a. An A.A.V may be used
only in residential buildings. (3-28-23)
b. In remodels, an A.A.V. may be used with
island fixtures or remotely located sinks such as in bar, kitchen, or laundry
tray locations. An A.A.V. may not be used in bathroom groups.
(3-28-23)
c. In new construction,
an A.A.V. may be used on island fixture sinks. (3-28-23)
d. Each A.A.V. may be used to vent only one
(1) floor. (3-28-23)
e. Each A.A.V.
must be readily accessible. (3-28-23)
f. The cross-sectional area of venting must
remain the same and must meet the largest required building drain.
(3-28-23)
g. An A.A.V. may only be
installed in accordance with the manufacturer's installation standards as per
ASSE 1051. (3-28-23)
h. An A.A.V
may not be used in an attic, crawl space, outside installation, or in
connection with chemical or acid waste systems. (3-28-23)
47.
Section
1002.3 Change of
Direction. Trap arms may not exceed one hundred eighty (180) degrees of
horizontal turn without the use of a cleanout. (3-28-23)
48.
Section
1007.0 Trap Seal
Protection. Delete section
1007.1 and replace with the
following: Floor drains or similar traps directly connected to the drainage
system and subject to infrequent use must be protected with a trap seal primer
or other approved trap seal protection device, except where not deemed
necessary for safety or sanitation by the Authority Having Jurisdiction. Trap
seal primers must be accessible for maintenance. (3-28-23)
49.
Section
1016.1 Discharge. Add the
following to the end of section
1016.1: Floor drains installed
in residential garages must be permitted to use the interceptor as the fixture
trap. (3-28-23)
50.
Section
1502.1 General. Add to
this section the following paragraph: Plumbing for a gray water system from any
fixture up to, but not to include the exterior irrigation system tank must be
inspected by the Authority Having Jurisdiction. The Idaho Department of
Environmental Quality (IDEQ) has jurisdiction to inspect and approve the
installation of the exterior irrigation system tank and all piping therefrom to
the point of disposal in accordance with IDAPA 58.01.03, "Individual/Subsurface
Sewage Disposal Rules." Gray water system location and design criteria
requirements related to irrigation and leaching is determined in accordance
with the requirements as established by the IDEQ. (3-28-23)
Notes
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