Just saw this on the campsite webpage:
County of San Diego: Agua Caliente County Park
SPECIAL NOTICE(04/12/12) - Agua Caliente Regional Park is currently under a water shortage due to the high demand at the park. In order to conserve the amount of water needed, park staff is asking all guests to take precautionary measures to conserve water by implementing the following strategies while camping and visiting the park:
Please take short showers, and turn off the water while soaping and shampooing.
Please turn off the water while brushing teeth, washing face or hands, and only turn on the water when needed.
Do not leave sink running when washing dishes. Please only use what you need to conserve.
Reuse water whenever you can. (e.g. dirty dishwater can be used to extinguish your fire, for example).
If you have an RV, consider practices such as turning off the shower when soaping and shampooing and filling up the sink with water to wash and rinse dishes to conserve water.
If you have an RV, ensure your fresh water tanks are full before you arrive to the park.
Please bring enough drinking water with you to get through your trip.
On behalf of County Parks and Recreation team, we apologize for any inconvenience this may cause, and we thank you for helping us conserve water.