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City of Azusa Building & Safety Department

213 E. Foothill Blvd. Azusa, CA 91702-1395

(626) 812-5234 Fax: (626) 334-5464

GRAYWATER SYSTEMS FOR

RESIDENTIAL BUILDINGS

A. GRAYWATER SYSTEMS

Under State regulations, graywater is defined as untreated wastewater that has not been

contaminated by toilet waste or unhealthy bodily wastes. Graywater includes wastewater from

bathtubs, showers, bathroom washbasins, clothes washing machines, and laundry tubs, but

does not include wastewater from kitchen sinks or dishwashers.

A graywater system uses graywater for subsurface irrigation and may include tanks, valves,

filters, pumps or other appurtenances along with piping and receiving landscape. Graywater

shall not be used in spray irrigation and shall not be allowed to pond, runoff or be discharged

directly into or reach any storm water system or any surface body of water. Additionally,

graywater shall not be used to irrigate root crops or edible parts of food crops that touch the

soil.

B. PERMIT REQUIREMENT

A plumbing permit is required to be obtained from the City of Azusa Department of Building

and Safety prior to the erection, construction, reconstruction, installation, relocation or

alteration of any graywater system. In order to approve plans and issue a permit for

a graywater system, the City of Azusa Mechanical Plan Check requires the following:

1. Two sets of plans and specifications showing the graywater system. The graywater

system shall be designed in accordance with the requirements within Chapter 16 of

the 2013 CPC, 1602.0 Gray Water Systems.

Exception: For simple residential system meeting all the following conditions, a

completed graywater standard plan issued by City of Azusa (attached) is acceptable:

a. Graywater discharge is 250 gallons or less per day;

b. The system does not include pumps to distribute graywater;

c. The system is not connected to any source of potable water or other irrigation

systems; and

d. Graywater is immediately discharged into the irrigation field without being stored

2.

A

pproval from the Los Angeles County Department of Public Health (DPH) Cross

Connection

Control Unit. Incorporate DPH’s requirements into the drawings. DPH

is located at 5050 Commerce Dr., Room 116, Baldwin Park, CA 91706,

Telephone number (626) 430-5290.

3.

Graywater systems being installed in the City of Azusa shall be appr

oved by

the City Engineering Division.

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C. EXEMPTION FROM PERMIT

A permit is not required from the Azusa Department of Building and Safety for a

graywater system in a one or two-family dwelling that is supplied by only a clothes-washer

system provided the system does not require cutting of the existing plumbing piping

and provided the following requirements are met:

1. The design shall allow for the user to have the option to direct the flow to the irrigation/

disposal field or the building sewer. The direction control of the graywater shall be

clearly labeled and readily accessible to the user.

2. The installation, change, alteration or repair of the system shall not include a potable

water connection, tank or a pump and shall not affect other building, plumbing, electrical

or mechanical components including structural features, egress, fire-life safety,

sanitation, potable water supply piping or accessibility.

3. The graywater shall be contained on the site where it is generated.

4. Graywater shall be directed to and contained within a subsurface irrigation or disposal

field.

5. Ponding or runoff is prohibited and shall be considered a nuisance.

6. Graywater shall be released no less than two (2) inches below the surface of mulch,

rock, or soil, or a solid shield covers the release point.

7. Graywater systems shall be designed to prevent contact of the graywater with humans

and domestic pets.

8. Water used to wash diapers or similarly soiled or infectious garments shall not be used

and shall be diverted to the building sewer.

9. Graywater shall not contain hazardous chemicals derived from activities such as

cleaning car parts, washing greasy or oily rags, or disposing of waste solutions from

home photo labs or similar hobbyist or home occupational activities. Graywater shall

not contain waste from kitchen sinks or dishwashers.

10.

Exemption from permit requirements of this code shall not be deemed to grant

authorization for any graywater system to be installed in a manner that violates other

provisions of this code or any other City or State laws or ordinances.

11. An operation and maintenance manual for a graywater installation shall be provided to

the owner and occupant. The manual is to remain with the building throughout the life

of the system and indicate that upon change of ownership or occupancy, the new owner

or tenant shall be notified the structure contains a graywater system.

12.

Comply with all other aspects of Chapter 16 of the 2013 CPC, 1602.0 Gray Water

Systems. (e.g. distance from property line, distance from building structure, etc).

13. Exemption from permit requirements of the code for clothes washer graywater systems

shall not be deemed to grant authorization to perform other work that requires a permit.

14. Any required fire rated separation, such as the one between the house and the attached

parking garage, shall be maintained.

Page 1 of 10

GRAYWATER STANDARD PLAN

For Simple Residential System

(Basedon2013CaliforniaPlumbingCodeChapter16)

ProjectAddress:________________________________ PermitNumber:_________________________

Scope:

ThisPlanappliesonlytosimpleresidentialsystemsmeetingallthefollowingcriteria:

 Graywaterdischargeis250gallonsorlessperday;

 Thesystemdoesnotincludepumpstodistributegraywater;

 Thesystemisnotconnectedtoanysourceofpotablewaterorotherirrigationsystems;and

 Graywaterisimmed

iatelydischargedintotheirrigationfieldwithoutbeingstored

Designerinform

ation:

Name: PhoneNumber:() ‐

Address:______________ _______________

__________________

City:___________________________________________________

State:_______Zip__________

Homeowner Contractor

License#

Licensetype:_____

Engineer/Architect

License#

LicenseType:

Checklist

Checkif

provided

Item Comments(ifany)

Provideasiteplan

Showthelocationofthegraywatersystemonthesiteplan

Showthesetbackdistancesofgraywate rirrigationsystemperTable16A‐1,Page7

Provideapipingriserdiagram

Providemanufacturer’sliteratureforvalvesandpipesused

ApprovalfromtheLosAngelesCountyHealthDepartmenthasbeenobtained

Graywaterisnotconnectedtoany potablewater

3‐waydivertervalveisclearlylabeledtoindicatedirectionofflow

Backwatervalveisinstalledonsewersideof3‐wayvalveinthehorizontalposition

Drainagepipingissizedper2013 California PlumbingcodeTable703.2

Irrigationfieldsizesareshownonsiteplanandmeetminimumrequirements

Graywaterdischargeisminimum of2”belowsurfaceorhave2”minimummulchcover

Graywaterisnotirrigatingedibleportionofplants (i.e.norootcrops)

Groundwaterdepthisbelow3ft.andwascheckedwithatesthole

Pipingmaterialisindicatedonthesiteplanandontheriserdiagram

Project Address: ____________________________________

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GRAYWATER STANDARD PLAN

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1. DailyGraywaterFlowCalculation

a. Number ofbedrooms:

b. Numberofoccupants(1+ numberofbedrooms):

c. Typeoffixturesconnectedtograywatersystem(checkallthatapply)

Lavatory(bathroomsink) Shower/bath Washingmachine/washbasin

d. DailyGraywaterflow: gallonsperday.(shallnotexceed250gallons)

EstimateGraywaterflowperoccupant:

Anycombinationoflavatory,showerorbath:25gallonsperday peroccupant

Laundry(washingmachineorwashbasin):15gallons/dayperoccupant

Dailygraywaterflowexample:(4occupantsx 25gals/day)+(4occupantsx15gals/day)=160Gallonsperday.

2. SoilType(fromTable16A‐2onpage9):

(Note:Writtenverificationofthesoiltype, fromaProfessionalCivilEngineer,isrequiredfordesignsinvolvingthe

followingsoiltypes:sandyloam,finesand,coursesandorgravel)

3.

MaximumAbsorptioncapacityofsoil(from2013 CPC column2ofTable1602.10)

gallons/ft

2



4. Sizeofirrigationfield

a. Minimumrequiredirrigationfieldsize:  squarefeet

Minimumirrigationfieldsize:Dividetotalgallonsperday(fromstep1d)bythemaximumabsorptioncapacityof

thesoil(step3).

Example:160gallon/dayofgraywaterinfinesandsoilwouldneed160/4.0=40squarefeetofirrigationarea

b. Actualirrigationfieldsizeprovid ed: squarefeet

Notes:

1. Pipeshallbelabeled“NON‐POTABLEWATER,DONOTDRINK”perDepartmentofPublicHealth(DPH)guidelines.

2. Allvalvesshallbereadilya ccessible.

3. Installationdoesnotviolateothercodesordamagethebuilding.Anypenetrationinthebuildingenvelopeshall

beproperlysealed.

4. Onlypipesapprovedforwasteshallbeusedintheplumbingdrainagesystem.

5.

Upgradesmadetoplumbingshallbepermittedandshallcomplywiththe2013 California PlumbingCode.

Project Address: ____________________________________

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10

GRAYWATER STANDARD PLAN

For Simple Residential System

ROOFPLAN

PROVIDEAROOFPLANSHOWINGLOCATIONOFALLEQUIPMENT,

DISCONNECTINGMEANSANDREQUIREDCLEARANCES.

PLOTORSITEPLAN

Indicatewhereonthepropertythegraywaterwillbeused(seesamplesiteplanonpage7).Indicatesetbackstopropertylines,house

andotherstructures.Indicatepipingmaterial.Showstreetfrontage.



Project Address: ____________________________________

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GRAYWATER STANDARD PLAN

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

PIPING RISER DIAGRAM FOR

GRAYWATER SYSTEM

Show fixtures draining to the graywater system including

waste & vent piping and valves. Indicate piping material.

See sam

p

le drawin

g

on

p

a

g

e 8



Project Address: ____________________________________

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GRAYWATER STANDARD PLAN

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Detail1:Typicaldetailforirrigationfield



Project Address: ____________________________________

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GRAYWATER STANDARD PLAN

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Detail2:Typicaldetailfordisposalfieldpiping

 



Project Address: ____________________________________

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SamplePlotPlan

Thisdrawingisforreferenceonly

Project Address: ____________________________________

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Samplepipingrisediagramforgraywatersystem

Thisdrawingisforreferenceonly

Project Address: ____________________________________

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Table1602.10(2013 CaliforniaPlumbingCode)

SoilType

(Column1)

Maximumabsorptioncapacityingallonspersquarefootof

irrigationareaperday

(Column2)

Coursesandorgravel 5.0

Finesand 4.0

Sandyloam 2.5

Sandyclay 1.7

Claywithconsiderablesandorgravel 1.1

Claywithsmallamountsofsandorgravel 0.8

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

Notes:

1

Excluding trap arm.

2

Except sinks, urinals, and dishwashers – exceeding 1 fixture unit.

3

Except six-unit traps or water closets.

4

Only four water closets or six-unit traps allowed on a vertical pipe or stack; and not to exceed three water closets or six-unit traps on a horizontal branch

or drain.

5

Based on

1

⁄4 inch per foot (20.8 mm/m) slope. For

1

⁄8 of an inch per foot (10.4 mm/m) slope, multiply horizontal fixture units by a factor of 0.8.

6

The diameter of an individual vent shall be not less than 1

1

⁄4 inches (32 mm) nor less than one-half the diameter of the drain to which it is connected.

Fixture unit load values for drainage and vent piping shall be computed from Table 702.1 and Table 702.2(b). Not to exceed one-third of the total permitted

length of a vent shall be permitted to be installed in a horizontal position. Where vents are increased one pipe size for their entire length, the maximum

length limitations specified in this table do not apply. This table is in accordance with the requirements of Section 901.2.

TABLE 703.2

MAXIMUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING

SIZE OF PIPE (inches)

1

⁄4 1

1

⁄2

2

1

⁄2

3 4 5 6 8 10 12

Maximum

Units

Drainage Piping

1

Vertical

Horizontal

1

2

1

16

3

8

3

32

3

14

3

48

4

35

4

256

216

5

600

428

5

1380

720

5

3600

2640

5

5600

4680

5

8400

8200

5

Maximum Length

Drainage Piping

Vertical, (feet)

Horizontal (unlimited)

45 65 85 148 212 300 390 510 750

– –

Vent Piping

Horizontal and Vertical

6

Maximum Units

Maximum Lengths, (feet)

1

45

8

3

60

24

120

48

180

84

212

256

300

600

390

1380

510

3600

750

– –

Project Address: ____________________________________

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