The only place where you can dump your gray water on the ground is on BLM lands, but state laws may still prevent you from doing so.
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Is It Legal to Dump RV Grey Water on the Ground?
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Can I Legally Dump Gray Water On The Ground While RV Camping?
Disposing of Wastewater from showering and washing dishes when camping
Disposing of Wastewater from showering and washing dishes when camping
Boondocking Essentials - Reset Your Journey