Rincon Water serves two distinct geographical areas, both of which have different potable water portfolios. These geographical areas are delineated as Improvement District 1 (ID 1) and Improvement District A (ID A). In most cases, you can determine your geographical area by using the first two digits of your account number . Locate the first two digits in the table below to identify the associated ID for your property.
| First Two Digits of Your Account Number | ID |
| 75 through 85, 93, and 95 | A |
| 01 through 48, 94, 96, and 97 | 1 |
Maps
- Improvement Districts
- District Divisions
About ID A Water
Rincon Water purchases ID A water from the City of Escondido (City). This supplier has two sources of water. The first source is purchased from the San Diego County Water Authority (SDCWA), which purchases water from the Metropolitan Water District of Southern California (MWD). MWD imports water from two sources: a 242 mile-long aqueduct which transports Colorado River water from Lake Havasu and a 444 mile-long aqueduct that transports water from the Sacramento-San Joaquin Delta in Northern California. The second City source is local water which originates from Lake Henshaw in the San Luis Rey River Watershed. Both sources of water are blended and treated at the Lake Dixon Water Treatment Plant before delivery into the ID A distribution system. To access the 2023 Consumer Confidence Report for IDA, click here.
About ID 1 Water
In previous years, the ID 1 water delivery system consisted only of 100% imported water purchased from the San Diego County Water Authority (SDCWA), which in turn, purchased this water from the Metropolitan Water District of Southern California (MWD). MWD water is imported from two sources: Colorado River water from Lake Havasu and Sacramento-San Joaquin Delta water from Northern California. The water is blended and treated at the Robert A. Skinner Treatment Plant, located in Riverside County, before being delivered into Rincon Water’s distribution system.
Since 2016, ID 1 water supplies are augmented from time-to-time with water originating from the Twin Oaks Valley Water Treatment Plant (TOVWTP). TOVWTP water is a blend of treated SDCWA water and desalinated sea water from the Claude “Bud” Lewis Carlsbad Desalination Plant (Lewis Desal Plant). Originating from the Carlsbad Agua Hedionda Lagoon, the desalinated water is a superior quality water – free of salt as well as biological and organic compounds. To access the 2023 Consumer Confidence Report for ID1, click here.