R&R do you happen to have a clean out for your house sewer? If you do and you can get the RV near that can be an effective way to dump at home.
Before discharging grey water you need to laws in your City or County, being your in California I'd be cautious about doing it. I agree with Dave too, you can end up with some pretty bad smells from it. We camped in dispersed camping area in the desert, the Ranger encouraged watering the bushes with the grey water but recommended using a old garden hose with a sprinkler that would act as a filter for any solids. I'm not sure I'd be inclined to do it at home though.
