PROPOSED ACTION ON REGULATIONS
MARYLAND REGISTER, VOLUME 40, ISSUE 3,
FRIDAY, FEBRUARY 8, 2013
Title 09 DEPARTMENT OF LABOR, LICENSING, AND REGULATION
Subtitle 20 BOARD OF PLUMBING
09.20.01 State Plumbing Code
Authority: Business Occupations and Professions Article, §§ 12-205 and 12-207,
Annotated Code of Maryland
Notice of Proposed Action
The State Board of Plumbing proposes to amend Regulations .01 and
.02 and to adopt new Regulation .04 under COMAR 09.20.01 State Plumbing
Code. This action was considered at a public meeting of the Maryland Board of Plumbing held on
November 15, 2012, notice of which was given by publication in 39:22 Md. R. 1473 (Nov. 2, 2012),
pursuant to State Government Article, §10-506(c), Annotated Code of Maryland.
Statement of Purpose
The purpose of this action is to is to incorporate by reference the 2012 National Standard
Plumbing Code Illustrated, the 2012 National Fuel Gas Code (ANSI Z223.1, NFPA 54), and the 2011 Liquefied
Petroleum Gas Code (NFPA 58). The Board further proposes to adopt revised Maryland modifications to the
National Standard Plumbing Code Illustrated and the National Fuel Gas Code, ANSI Z223.1, NFPA 54.
Comparison to Federal Standards
There is no corresponding federal standard to this proposed action.
Estimate of Economic Impact
The proposed action has no economic impact.
Economic Impact on Small Businesses
The proposed action has minimal or no economic impact on small businesses.
Impact on Individuals with Disabilities
The proposed action has no impact on individuals with disabilities.
Opportunity for Public Comment
Comments may be sent to Steven Smitson, Executive Director, Board of Plumbing, Department of Labor, Licensing and
Regulation, 500 North Calvert Street, Third Floor, Baltimore, MD 21202, or call 410-230-6169, or email to
firstname.lastname@example.org, or fax to 410-333-6314.
Comments will be accepted through April 15, 2013. A public hearing has not been scheduled.
Final action on the proposal will be considered by Board of Plumbing during a public meeting to be held on April 18,
2013, at 500 North Calvert Street, Baltimore, MD 21202.
Editors Note on Incorporation by Reference
Pursuant to State Government Article, §7-207, Annotated Code of Maryland, Liquefied Petroleum Gas Code,
NFPA 58 (2011 Edition); National Fuel Gas Code, ANSI Z2223.1, NFPA 54 (2012 Edition); and 2012 National
Standard Plumbing Code Illustrated (Plumbing-Heating-Cooling Contractors National Association) have
been declared documents generally available to the public and appropriate for incorporation by reference.
For this reason, they will not be printed in the Maryland Register or the Code of Maryland Regulations
(COMAR). Copies of these documents are filed in special public depositories located throughout the State.
A list of these depositories was published in 40:1 Md. R. 9 (January 11, 2013), and is available online at
online. These documents may also be inspected at the
office of the Division of State Documents, 16 Francis Street, Annapolis, Maryland 21401.
.01 Incorporation by Reference.
A. (text unchanged)
B. Documents Incorporated.
(1)  2012 National Standard Plumbing Code Illustrated (National Association of
[(2) 2007 Supplement to the 2006 National Standard Plumbing Code (National Association of
[(3)](2) National Fuel Gas Code, ANSI Z223.1, NFPA 54,  2012 Edition.
[(4)](3) Liquefied Petroleum Gas Code, NFPA 58,  2011 Edition.
.02 Modifications to the National Standard Plumbing Code Illustrated.
A. (text unchanged)
B. Basic Principles Section.
(1)(3) (text unchanged)
(4) Add a new Principle No. 23INSTALLATION OF GAS APPLIANCES GAS PIPING, which shall read:
All installations of gas appliances gas piping shall conform to requirements contained in the codes promulgated
by the National Fire Protection Association, ANSI, National Fuel Gas Code, Z223.1, NFPA 54, 
2012, and the Liquefied Petroleum Gas Code, NFPA 58, 
2011, which are incorporated by reference.
C. Chapter 1 DEFINITIONSSection 1.2 DEFINITION OF TERMS.
(1) (text unchanged)
(2) On page  35, insert a new definition after the definition of Flushometer Valve.
The new defined term is: Frostproof Closet: A hopper with no water in the bowl and with the trap and water supply
control valve located below the frost line.
(3) On page  37, insert a new definition after the definition of House Trap. The
new defined term is: Incidental Plumbing Services: Repair of faucets, ball-cock valves, and shutoff valves;
cleaning of choked drain lines and repairing of minor leaks. Incidental Plumbing Services does not include
replacement of any plumbing fixture, new installation, or any work, including repairs of faucets, ball-cock
valves, and shutoff valves, cleaning of choked drain lines, and repairing of minor leaks, that requires a
permit from a local administrative authority.
(4) On page  38, insert a new definition after the definition of Individual
Vent. The new defined term is: Individual Water Supply: A supply other than an approved public water supply
which serves one or more families.
(5) On page  42, insert a new definition after the definition of Medical Vacuum
Systems. The new defined term is: Minor Repair Services: Repair or replacement of faucets, ball-cock valves,
and shut-off valves; cleaning of choked drain lines; and repairing leaks in piping and fixtures that do not
require changes in sizes, types of materials, or pipe configuration. Minor Repair Services does not include
complete replacement of any plumbing fixture, new installation, or any work described in this paragraph if a
permit is required from the local administrative authority.
(6) On page  , insert at the end of the definition Plumbing System, the language,
within the property line. Add this sentence to the end of the definition: It does not include the mains
of a public sewer system or private or public sewage treatment or disposal plant outside the property line.
(7) On page  50, insert a new definition after the definition Sanitary Sewer.
The new defined term is: Scavenger: Any person engaged in the business of cleaning and emptying septic tanks,
seepage pits, privies, or any other sewage disposal facility.
(8) On page  50, insert a new definition after the definition Seepage Well or
Pit. The new defined term is: Separator: See Interceptor.
(9) On page  58, insert a new definition after Vacuum Breaker, Spillproof.
The new definition is: Vacuum Intake: A vacuum intake has no trap or mechanical device to keep gasses from
leaving the sewer line. An intake is a vertical pipe installed to provide circulation of air to the drainage
system. No intake terminal shall be located directly beneath any door, window or other ventilating opening
of the building or of an adjacent building, nor shall any such intake terminal be within 10 feet horizontally
of such an opening unless it is at least 2 feet above the top of such opening.
D. Chapter 3 MATERIALS.
(1) On page  89, under Section 3.1 MATERIALS, add new Subsection [3.1.5]
3.1.6 which would be defined as:
[3.1.5.] 3.1.6 Adoption of Uniform Color
[a. Refer to 10.2 Identification of Potable and Non-Potable Water.
b.] All subsurface pipes must be permanently marked or completely colorized for easy
identification as follows:
[(i)] a. YELLOWgas, oil, steam, petroleum, or gaseous materials;
[(ii)] b. BLUEwater;
[(iii) LAVENDER] c. PURPLEreclaimed water.
(2) On page  95, under Section 3.12 ALTERNATE MATERIALS AND METHODS, add the following subsection:
3.12.6 Fire Rating
a. All pipe penetrating a fire-rated wall or ceiling shall meet the integrity of
the wall or ceiling.
b. Conformance to this requirement shall be evidenced by a test report from a
nationally recognized fire testing laboratory.
E. Chapter 5 TRAPS [AND CLEANOUTS], CLEANOUTS AND BACKWATER VALVES.
On page  143, in Section 5.1 SEPARATE TRAPS FOR EACH FIXTURE, paragraph d[(2).]
(3), add the words: , one compartment is not more than 6 inches deeper than the other, and
neither outlet is equipped with a food-waste grinder, after the word [apart]
F. Chapter 6 LIQUID WASTE TREATMENT EQUIPMENT.
(1) On page  160, in Section 6.1.7 Point of Discharge, delete the only
sentence and replace it with:
a. In a structure where a public sanitary sewer is available, the waste
pipe from oil and sand interceptors shall discharge, if installed, into the public sanitary sewer, or any
more restrictive manner as otherwise mandated by an applicable [Administrative Authority]
b. New Construction
1. Any new construction of a structure, where public sanitary
sewers are not available, shall have the option to either:
(i) Construct the structures without any floor
drains; structures without floor drains must operate to minimize waste and prevent wastewater from
leaving the shop area and discharging to the environment; or
(ii) If drains are included, ensure that each
drain shall flow into an approved sand interceptor which shall drain into a 1,000 gallon or larger
approved holding tank.
2. An oil and water separator is not required when the waste
discharges into a holding tank.
c. Existing Structures
1. In areas where public sanitary sewers are not available,
existing structures that are being renovated or enlarged shall either:
(i) Permanently plug all existing floor drains;
structures which plug their floor drains must notify the Maryland Department of Environment, Ground
Water Permits Program, prior to drain closure, and must operate to minimize waste and prevent wastewater
from leaving the shop area and discharging to the environment; or
(ii) Retrofit all existing floor drains so as to
allow them to flow into an approved sand interceptor which shall drain into a 1,000 gallon or larger
approved holding tank.
2. An oil and water separator is not required when the waste
discharges into a holding tank.
d. If an underground tank is installed, it shall be corrosion protected
and designed according to COMAR 26.10.03.
e. Any new construction of a structure or renovation of an existing
structure which discharges liquid wastes as described in Section 6.1.1 of this code or which discharges
other industrial waste waters shall have the option of discharging into an on-site subsurface disposal
system, providing the facilitys owner/operator applies for and obtains from the Maryland Department of
the Environment a water discharge permit issued pursuant to the provisions and conditions of COMAR 26.08.0126.08.04.
(2) On page  165, in Section 6.2 GREASE INTERCEPTORS [(If Required)], add a new subsection:
[6.2.9] 6.2.13 Commercial Buildings, a grease interceptor is not required in
restaurants, hotel kitchens, bars, factory cafeterias or restaurants, clubs, or other similar establishments,
except in special cases as may be determined by the local [Administrative]
Authority Having Jurisdiction.
G. Chapter 7 PLUMBING FIXTURES, FIXTURE FITTINGS AND PLUMBING APPLIANCES.
(1) On page  174, in Subsection 7.4.5 Water Closet Seats, add a new paragraph:
a. A closed front seat may be installed on an elongated bowl in a single family residence.
(2) On page  192, in Section 7.21 MINIMUM NUMBER OF REQUIRED FIXTURES, Subsection
7.21.4 Separate Facilities, add the following after [#4] EXCEPTION (4):
[5a.] (5)a. In new construction for assembly and mercantile occupancies,
an accessible unisex toilet may be provided where an aggregate of six or more male or female water closets
are required. In buildings of mixed occupancy, those water closets required for the assembly or mercantile
portion of the occupancy would be used to determine the ability to make use of the unisex toilet room
option. The inclusion of the one accessible unisex toilet room shall be allowed to replace both one male
and one female toilet.
b. Unisex toilet rooms shall comply with this section and the requirements
for accessible toilet rooms as per standards prescribed in COMAR 05.02.02 Maryland Accessibility Code.
c. Unisex toilet rooms shall include only one water closet and only one lavatory.
d. Unisex toilet rooms shall be located on an accessible route. Unisex
toilet rooms shall be located not more than one story above or below separate-sex toilet rooms. The
accessible route from any separate-sex toilet rooms to a unisex toilet room shall not exceed 500 feet/152.4m.
e. Unisex toilet rooms shall be designated by accessible signs.
Directional signage shall be provided at all separate-sex toilet rooms indicating the location
of the nearest unisex toilet room.
H. Chapter 9 INDIRECT WASTE PIPING AND SPECIAL WASTE.
On page  215, add a new subsection:
9.4.4 REFRIGERATION WASTE
If required, refrigeration waste pipes may not be smaller than shown in the following:
a. 11/4 inch: 1 inlet serving not more than 100 cubic feet of refrigeration space;
b. 2 inch: 4 to 1211/4 inch inlets or the equivalent refrigeration space;
c. 3 inch: 13 to 3611/4 inch inlets or the equivalent refrigeration space.
I. Chapter 10 WATER SUPPLY AND DISTRIBUTION.
(1) On page  219, in Section 10.4 PROTECTION OF POTABLE WATER SUPPLY,
Subsection 10.4.9, delete the heading and explanation in its entirety and insert a new heading
Water Heaters Used for Space Heating, and insert the following :
a. The installation of any system or equipment utilizing water
heaters to provide heat must be installed by a person who is licensed to perform the work in Maryland
and who has obtained the necessary local permits for such installations.
b. This section is applicable to:
1. A combination heating system, which is installed as a
unit and incorporates a water heater as an integral part of the system, to provide the primary heat
source to the dwelling;
2. Pieces of equipment sold as an add-on to an existing
heating system for the purpose of providing supplemental heat, and is attached to a water heater
containing water which may later be expected to be used as potable water.
c. All installations shall comply with the following:
1. Combination water/space heating equipment,
materials and components shall be suitable for use with potable water and listed for such use;
2. Water heaters, piping and components connected
for a space heating application shall be properly sized and installed according to manufacturers
3. Water heaters used in combination water/space
heating systems shall be listed as complying with American National Standards (ANSI) Z21.10.1, Z21.10.3
or UL732, as applicable;
4. A water temperature control valve shall be installed
with every installation utilizing a combination water heating/space heating system application to
limit domestic hot water temperature safe for ordinary domestic use by individuals;
5. The installer must disinfect and certify the water
system whenever required by the Administrative Authority under §10.9 of this Code;
6. The system shall be equipped with a means for periodic
circulation between the water heater and the exchanger during off seasons;
7. An acceptable means shall be provided to prevent thermal
circulation through the exchanger during off seasons, except circulation necessary to comply with subparagraph (6);
8. A copy of the documentation to support the requirements
of these subparagraphs shall be available for an inspectors review during inspections and shall
remain with the unit;
9. For all such devices used in Maryland, an informational
sheet shall be provided that outlines all of the requirements of this subsection.
(2) On page  219, in Section 10.4 PROTECTION OF POTABLE WATER SUPPLY, add a
10.4.10 Prohibited Connections to Fixtures and Equipment
a. Connection to the potable water supply system for the following
shall be protected against backflow:
1. Operating, dissection, embalming and mortuary tables or
similar equipment; in these installations, the hose used for water supply shall terminate at least 12
inches away from every point of the table or attachments;
2. Water closets equipped with flushometer valves or
with flushing tanks with submerged float operated ball-cocks;
3. Seat-acting water closets;
4. Bed pan washers;
6. Sterilizers with water supply connections;
7. Therapeutic baths with inlets below the rim of the fixture;
8. Water operating waste ejectors, such as used by
dentists, undertakers and those who practice colonic irrigation;
9. Bathtubs with inlets below the rim of the fixture;
10. Wash basins with inlets below the rim of the fixture;
11. Bar, soda fountain, or other sinks with submerged inlets;
12. Laundry trays with faucets below the rim;
13 Sinks with faucets or water inlets below the rim
and sinks with loose hose connections;
14. Dishwashing sinks or machines with water inlets below the rim;
15. Cuspidors with water supply connections;
16. Dental cuspidors with water supply connections;
17. Hospital appliances generally, such as sterilizers,
condensers, filters, stills, pipette washers, aspirators, and washers;
18. Frostproof hydrants with underground bleed or
automatic livestock watering devices;
19. Industrial vats, tanks, etc. of any description
which have an inverted water supply connection, or a water supply connection below the top of the
spill rim, or in which a hose filler is used;
20. Industrial water supplied process appliances
with direct water connections;
21. A rubber hose with hand control or self-closing
faucets attached, as used in connection with baths, industrial vats, tanneries, etc.;
22. Pressure water supplied sealing rings on sewage and sludge pumps;
23. Water supply for priming connections;
24. Water supply (hot or cold) to laundry equipment;
25 Condenser cooling connections for refrigeration
and air conditioning machinery;
26. Drains from fire sprinklers connected directly to sewers or wastes;
27. Steam tables;
32. Photographic developing tanks;
33. Laboratory water faucets and cocks with
serrated nipples or hose connections; and
34. Any other fixture or installation creating a similar hazard.
b. Fixture inlets or valved outlets with hose attachments which
may constitute a cross-connection shall be protected by an approved vacuum breaker installed at least 6
inches above the highest point of usage and located on the discharge side of the last valve. Fixtures with
integral vacuum breakers manufactured as a unit may be installed in accordance with their approval requirements.
(3) On page  219, in Section 10.4 PROTECTION OF POTABLE WATER SUPPLY, add a new subsection:
10.4.11 Used Water Return
Water used for cooling of equipment or other processes may not be returned to the
potable water system. The water shall be discharged into a drainage system through an air gap or may be used
for nonpotable purposes on written approval of the Administrative Authority.
(4) On page  235, in Subsection 10.8.6 Tank Drain Pipes, add the following Table
10.8.6 to this paragraph: SIZE OF DRAINPIPES FOR WATER TANKS
|SIZE OF DRAINPIPES FOR WATER TANKS
up to 750
|751 to 1500
1501 to 3000
3001 to 5000
5001 to 7500
(5) On page  236, in Section 10.10 WATER
SUPPLY SYSTEM MATERIALS, add a new subsection:
10.10.1 Water Service Pipe
Copper tube when used underground may not be less than type L. All threaded ferrous pipe and
fittings shall be galvanized or cement lined, and, when used underground in corrosive soil or
filled ground, shall be coal-tar enamel coated, or its equivalent, and threaded points shall
be coated and wrapped when installed.
(6) On page  255, in Section 10.16 SAFETY DEVICES FOR PRESSURE
VESSELS, Subsection 10.16.6, add a new paragraph: h. All water heaters, first floor and above,
shall have a pan with a drain to an approved drainage point, unless a variance is granted by the
local [Administrative] Authority
J. Chapter 11 SANITARY DRAINAGE SYSTEMS.
On page  261, [add a new subsection: 11.2.4 Building Sewer Size] in Section 11.2
Building Sewers and Building Drains, Subsection 11.2.3 Building Sewer and Building Drain Size,
add a new sentence after 11.5.1A: The minimum size of the building sewer shall be  3 inches.
[K. Chapter 12 VENTS AND VENTING.
(1) On page 296, in Section 12.11 STACK VENTING, add a new subsection:
12.11.3 Maryland Additional Requirements.
a. Stack venting may be used in any building that cannot
have more than three-story levels of plumbing fixtures.
b. Fixture unit loading capacities may not exceed one-half
of the capacities listed in Table 11.5.1A and Table 11.5.1B.
c. Each trap arm shall be individually connected into the
stack or horizontal line, and the maximum length of the trap arm may not exceed 5 feet. Side inlet
connections into a 4-inch closet bend shall be accepted as individual connections.
d. Entrance fittings from a stack into a horizontal line shall
have the equivalent sweep and radius of two 45 degree fittings with 1 foot of pipe between the fittings,
or the fittings shall have a radius of two times the nominal pipe diameter. The vertical portion of the
line shall be completely outside the junction area that turns horizontal.
e. Entrance fittings into a stack or in a change of direction from
horizontal to vertical, horizontal to horizontal shall have a minimum radius of one pipe diameter of the
upstream horizontal pipe.
f. When all of the plumbing fixtures can only be on one story
level, the stack or horizontal drain can receive all of the permitted fixture unit capacity.
g. When the plumbing fixtures can be on two story levels, the maximum
fixture unit load on each possible story level may not exceed one half of the total permitted fixture unit
h. When the plumbing fixtures can be on three story levels, the
maximum fixture unit load on each possible story level may not exceed one third of the total permitted
fixture unit capacity.
i. The minimum size building drain and extensions to the
base of all stacks shall be 4 inches.
j. Offsets in stacks greater than at a 45 degree angle are
not permitted unless all piping from the start of the offset is increased one pipe size.
k. Fixtures for clothes washing and washing machines shall be installed
only on the lowest story level.
l. Fixtures other than another water closet may not be installed downstream
from a water closet unless there is a 5 foot length of pipe without any fixture connections before the
next fixture is connected.
m. All stacks shall continue undiminished in size through the roof.
n. There may not be any fixtures connected within 5 feet downstream or 3
feet upstream from the junction of a vertical line with a horizontal line.
o. The fitting at the junction of a vertical line with a horizontal line
shall be full size of the horizontal line to the point where the line is 90 degrees from a horizontal plane.
p. In order to permit variations and effective use of other sections of
this code, additional venting may be permitted by the local Administrative Authority. This venting may
consist of venting the base of the stack, or other venting, into the building drain, at least 5 feet
downstream or upstream from any other connection. Venting may also be permitted into a stack at least
5 feet downstream or upstream from any other connection.]
[L.] K.Chapter 15 TESTS AND MAINTENANCE. On page 
342, in Section 15.6 METHODS OF TESTING WATER SUPPLY SYSTEM, add a new subsection [d.]
e. containing the following sentence: The local [Administrative] Authority
Having Jurisdiction will resolve situations that create hardships or potential damage to
plumbing systems during testing.
[M.] L. Chapter 16 REGULATIONS GOVERNING INDIVIDUAL SEWAGE DISPOSAL SYSTEMS FOR HOMES
AND OTHER ESTABLISHMENTS WHERE PUBLIC SEWAGE SYSTEMS ARE NOT AVAILABLE. Delete [the heading and] all
sections of this chapter in its entirety on
pages 345358. Insert [a new heading SEWAGE DISPOSAL AND CERTAIN WATER SYSTEMS FOR HOMES AND
OTHER ESTABLISHMENTS IN THE COUNTIES OF MARYLAND WHERE A PUBLIC SEWAGE SYSTEM IS NOT AVAILABLE, and insert] below the heading
Refer to COMAR 26.04.02.
[N.] M. Chapter 18 MOBILE HOME AND TRAVEL TRAILER PARK PLUMBING [STANDARDS]
REQUIREMENTS. On page  371, in Subsection [18.4.2 RESERVED]
18.4.9, change the section heading, Wet Vented Branch Drain Lines to [WET VENTING]
Wet Venting, insert a. before No, and add the following paragraphs:
[a.] b. The drainage system of a utility or other building may
not discharge into a wet-vented line. A house sewer may not discharge into a wet-vented line.
[b.] c. A house sewer or part of a house sewer may not
function as a wet-vent.
[O.] N. Add a new Chapter 19 INSTALLATION OF GAS APPLIANCES AND GAS PIPING[.
], new Subsection 19.1 REQUIREMENTS FOR THE INSTALLATION OF GAS APPLIANCES AND GAS PIPING[.]
along with the following paragraph:
The requirements contained in the National Fire Protection Association, ANSI, National Fuel Gas
Code, Z223.1, NFPA 54,  2011, and the Liquefied Petroleum Gas Code, NFPA 58,  2012, which
are being incorporated by reference under Basic Principle #23, are hereby adopted as the installation
of gas appliances and gas piping requirements, provided, however, that this regulation may not be
construed to prevent incorporated gas companies from making connections of gas appliances for domestic purposes.
[P.] O. Add a new Chapter 20 WATER SUPPLY AND SEWAGE SYSTEMS IN THE SUBDIVISION OF
LAND IN MARYLAND, and add a new sentence: [Found in]
Refer to COMAR 26.04.03.
.04 Modifications to the National Fuel Gas Code, ANSI Z223.1, NFPA 54.
A. Chapter 7 GAS PIPING INSTALLATION. On page 63, in Section 7.13 ELECTRICAL BONDING AND GROUNDING:
(1) In subsection 7.13.1, change the section heading Pipe and Tubing Other Than CSST to
Gas Piping and Tubing, including CSST and, in both instances, delete the words other than CSST;
(2) In subsection 7.13.2, add to the heading CSST the words, with an Arc-Resistant
Jacket. Delete the paragraph under subsection 7.13.2, and insert the following:
A gas piping system that contains one or more segments of CSST without an arc-resistant
jacket shall be bonded in accordance with this section. CSST gas piping without an arc-resistant jacket shall
require an additional bond to the electrical service grounding electrode system. The bonding jumper shall
connect to a metallic pipe or fitting between the point of gas delivery and the first downstream CSST fitting.
The bonding jumper shall not be less than 6 AWG copper wire or equivalent;
(3) Add a new section as 7.13.3 with the heading, CSST with an Arc-resistant Jacket and
the following paragraph:
CSST gas piping with an arc-resistant jacket that is listed by an approved agency for
installation without the direct bonding required by section 7.13.2 shall be installed in accordance with
section 7.13.1 and the manufacturers installation instructions.;
(4) Renumber section 7.13.3 Prohibited Use to 7.13.4 with the same heading; and
(5) Renumber section 7.13.4 Lightning Protection Systems to 7.13.5, with the same
heading and insert the words, in a building after installed.
MICHAEL J. KASTNER, JR.
State Board of Plumbing