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wastewater from automatic dishwasher?

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jumper
jumper Member Posts: 2,265
in Plumbing
Is it black or gray? Run kitchen sink drain to septic but from the dishwasher?

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  • Larry Weingarten
    Larry Weingarten Member Posts: 3,306
    edited October 2023
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    Where I am in California, dishwasher drainage is considered black water. But maybe we have different physics. ;)

    Yours, Larry
  • kcopp
    kcopp Member Posts: 4,433
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    I would consider it grey water.

    However the 2015 IPC considers Grey water only coming from bathtubs, showers, lavatories and clothes washers.
  • Jamie Hall
    Jamie Hall Member Posts: 23,343
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    kcopp said:

    I would consider it grey water.

    However the 2015 IPC considers Grey water only coming from bathtubs, showers, lavatories and clothes washers.

    Consider @kcopp 's handy list, and one can see why dishwasher (and kitchen sink) water is not regarded as gray: everything on that list normally contains no solids and, in fact, very low nutrient levels (measured as BOD). Dishwashers, on the other hand, have a waste water which usually does contain moderately high levels of solids (ground up, granted, but there) and often remarkably high BOD levels. Hence it needs additional treatment -- hence blackwater.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Hot_water_fan
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,985
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    NYS & NYC...Grey water.  Human excrement & fluids = Blackwater.  Mad Dog 🐕 
    Consulting by Mad Dog & Matt Jr.
  • mattmia2
    mattmia2 Member Posts: 9,679
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    At least in certain stages it is likely to contain the types of bacteria that can make you sick.
  • ChrisJ
    ChrisJ Member Posts: 15,714
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    Wait.

    What about Kramer's bath water? :D
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
    mattmia2Mad Dog_2
  • Jamie Hall
    Jamie Hall Member Posts: 23,343
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    Let's put it this way, @ChrisJ . Kramer or not, I wouldn't be inclined to drink grey water without treatment... from anything. However, with mild treatment, it's great for irrigating things (though some plants object to soaps...), and with slightly more it's good for recharging aquifers. We waste a lot of water.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    ethicalpaulMad Dog_2CLamb
  • ChrisJ
    ChrisJ Member Posts: 15,714
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    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
    Mad Dog_2
  • Intplm.
    Intplm. Member Posts: 1,975
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    Good question. It's probably black water due to its content. Best answered by your local code and or department of public health.

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