G 13 - Health and Safety

Latest version.
  • (a)

    Graywater may contain fecal matter as a result of bathing and/or washing of diapers and undergarments. Water containing fecal matter, if swallowed, can cause illness in a susceptible person.


    Graywater shall not include laundry water from soiled diapers.


    Graywater shall not be applied above the land surface or allowed to surface and shall not be discharged directly into or reach any storm sewer system or any water of the United States.


    Graywater shall not be contacted by humans, except as required to maintain the graywater treatment and distribution system.


    Graywater shall not be used for vegetable gardens.

    (Ord. 95-0069 § 10 (part), 1995.)

    Table G-1
    Location of Graywater System

    Minimum Horizontal Distance From Surge Tank (feet) x 304.8 for mm Irrigation Field (feet) x 304.8 for mm
    Buildings or structures 5 8
    Property line adjoining private property 5 5
    Water supply wells 50 100
    Streams and lakes 50 50
    Seepage pits or cesspools 5 5
    Disposal field and 100 percent expansion area 5 4
    Septic tank 0 5
    On-site domestic water service line 5 5
    Pressure public water main 10 10
    Water ditches 50 50



    When mini-leach fields are installed in sloping ground, the minimum horizontal distance between any part of the distribution system and ground surface shall be 15 feet (4572mm).

    Including porches and steps, whether covered or uncovered, but does not include carports, covered walks, driveways and similar structures.

    The distance may be reduced to 0 feet for aboveground tanks if approved by the Administrative Authority.

    The distance may be reduced to 2 feet (610mm), with a water barrier, by the Administrative Authority, upon consideration of the soil expansion index.

    Where special hazards are involved, the distance may be increased by the Administrative Authority.

    Applies to the mini-leachfield type system only. Plus 2 feet (601mm) for each additional foot of depth in excess of 1 foot (305mm) below the bottom of the drain line.

    Applies to mini-leachfield-type system only.

    A 2-foot separation is required for subsurface drip systems.

    For parallel construction or for crossings, approval by the Administrative Authority shall be required.

    (Ord. 95-0069 § 10 (part), 1995.)

    Table G-2
    Mini-Leachfield Design Criteria of Six Typical Soils

    Type of Soil Minimum sq. ft. of irrigation area per 100 gallons of estimated graywater discharge per day Maximum absorption capacity, minutes per inch, of irrigation area for a 24-hour period
    1. Coarse sand or gravel 20 5
    2. Fine sand 25 12
    3. Sandy loam 40 18
    4. Sandy clay 60 24
    5. Clay with considerable sand or gravel 90 48
    6. Clay with small amount of sand or gravel 120 60


    (Ord. 95-0069 § 10 (part), 1995.)

    Table G-3
    Subsurface Drip Design Criteria of Six Typical Soils

    Type of Soil Maximum emitter discharge (gal/day) Minimum number of emitters per gpd of graywater production
    1. Sand 1.8 0.6
    2. Sandy loam 1.4 0.7
    3. Loam 1.2 0.9
    4. Clay loam 0.9 1.1
    5. Silty clay 0.6 1.6
    6. Clay 0.5 2.0


    Use the daily graywater flow calculated in Section G 6 to determine the number of emitters per line.






(Ord. 95-0069 § 10 (part), 1995.)