We found 166 public water systems that could serve the same population as Santa Margarita Water District-nichols I (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| South Coast Wd - South Coast | Laguna Niguel | 1,000,000 | 47 | 1 |
| South Coast Wd - Capistrano Beach | Laguna Niguel | 1,000,000 | 64 | 0 |
| City Of Anaheim | Anaheim | 450,000 | 306 | 1 |
| Irvine Ranch Water District | County of Orange | 390,000 | 307 | 2 |
| Moulton Niguel Water District | County of Orange | 343,606 | 44 | 0 |
| City Of Santa Ana | Santa Ana | 342,930 | 225 | 6 |
| City Of Huntington Beach | Huntington Beach | 201,000 | 128 | 2 |
| City Of Garden Grove | Garden Grove | 170,883 | 201 | 0 |
| Santa Margarita Water District | San Juan Capistrano | 159,632 | 61 | 1 |
| City Of Orange | Orange | 138,640 | 268 | 0 |
| City Of Fullerton | Fullerton | 138,251 | 210 | 3 |
| Golden State Wc - West Orange | County of Orange | 114,016 | 209 | 0 |
| Mesa Water District | County of Orange | 110,000 | 107 | 1 |
| El Toro Water District | Lake Forest | 97,258 | 39 | 1 |
| City Of Westminster | Westminster | 91,169 | 177 | 4 |
| City Of Buena Park | Buena Park | 83,347 | 113 | 4 |
| YORBA LINDA WATER DISTRICT | County of Orange | 76,018 | 67 | 0 |
| City Of Tustin | Tustin | 67,700 | 110 | 5 |
| City Of Newport Beach | Newport Beach | 66,467 | 64 | 1 |
| City Of La Habra | La Habra | 60,239 | 97 | 48 |
| City Of Fountain Valley | Fountain Valley | 56,464 | 116 | 4 |
| City Of San Clemente | San Clemente | 51,504 | 97 | 3 |
| Laguna Hills Water Co | Laguna Hills | 47,842 | 0 | 0 |
| City Of Brea | Brea | 43,328 | 50 | 2 |
| City Of San Juan Capistrano | San Juan Capistrano | 40,000 | 114 | 9 |
| Golden State Wc - Placentia | County of Orange | 36,374 | 93 | 0 |
| City Of Seal Beach | Seal Beach | 25,561 | 53 | 0 |
| Laguna Beach County Wd | Laguna Beach | 23,365 | 40 | 1 |
| City Of La Palma | La Palma | 16,500 | 33 | 0 |
| Trabuco Canyon Water District | County of Orange | 13,175 | 37 | 4 |
| Serrano Water District | County of Orange | 6,641 | 0 | 2 |
| Golden State Wc - Yorba Linda | County of Orange | 5,551 | 0 | 0 |
| Golden State Wc - Cowan Heights | County of Orange | 5,390 | 55 | 0 |
| Mwdoc-south Orange County Ocean Desal | County of Orange | 3,300 | 0 | 0 |
| East Orange County Wd - Rz | County of Orange | 3,000 | 0 | 1 |
| Knott S Berry Farm | County of Orange | 3,000 | 0 | 5 |
| Eastside Water Association | County of Orange | 2,000 | 0 | 4 |
| Los Alamitos Race Course | County of Orange | 1,900 | 0 | 7 |
| South Main Mutual Wtr Co Inc | County of Orange | 1,500 | 0 | 0 |
| Midway City Mutual Wc | Midway City | 1,257 | 0 | 13 |
| Hansen School | County of Orange | 900 | 0 | 0 |
| Mission Land Company | County of Orange | 850 | 0 | 0 |
| South Midway City Mutual Water Co. | Midway City | 708 | 0 | 8 |
| Sandra Wall | County of Orange | 650 | 0 | 0 |
| Canyon Rv Park | County of Orange | 557 | 0 | 5 |
| Caspers Regional Wilderness Park | County of Orange | 515 | 0 | 0 |
| Irvine Regional Park | County of Orange | 500 | 0 | 0 |
| Villa Capri Mobile Estates | County of Orange | 450 | 0 | 0 |
| Fairlane Mobile Lodge | County of Orange | 420 | 0 | 0 |
| Myoma Dunes Mutual Water Compa | County of Orange | 405 | 0 | 0 |
| Juan Lopez | County of Orange | 400 | 0 | 0 |
| Del Prado Bolsa Mobil Homes | County of Orange | 400 | 0 | 0 |
| Crystal Wells Apartments | County of Orange | 350 | 0 | 0 |
| Midway Trailer City | Midway Mobl Hom | 350 | 0 | 0 |
| Peralta Hills Water Co | County of Orange | 333 | 0 | 0 |
| Glenhaven Mobilodge | County of Orange | 275 | 0 | 0 |
| H E Ramey Pres/w Hart Main | County of Orange | 270 | 0 | 0 |
| Garden Grove Acres01 | County of Orange | 220 | 0 | 0 |
| Diamond Park Mutual Water Co. | County of Orange | 200 | 0 | 0 |
| Green River Golf Club | County of Orange | 200 | 0 | 0 |
| Cypress Acres Water Associatio | County of Orange | 194 | 0 | 0 |
| Murrieta M W C | County of Orange | 178 | 0 | 0 |
| Emerald Isle Trailer Park | County of Orange | 160 | 0 | 0 |
| Boulevard Gardens Water Co | County of Orange | 150 | 0 | 0 |
| Catalina Street Pump Owners | County of Orange | 150 | 0 | 0 |
| Boulevard Gardens Water Co | County of Orange | 140 | 0 | 0 |
| Orange Coast Yellow Cab Co | County of Orange | 140 | 0 | 0 |
| Sheriff/coroner Dept | County of Orange | 140 | 0 | 0 |
| Hynes Estates Mutual Water Co. | County of Orange | 120 | 0 | 0 |
| California Labor Camp | County of Orange | 120 | 0 | 0 |
| Jack Hale, President | County of Orange | 116 | 0 | 0 |
| Page Avenue Mutual Water Company | County of Orange | 115 | 0 | 0 |
| Cal Va Dairy | County of Orange | 100 | 0 | 0 |
| Wintersburg Community | County of Orange | 98 | 0 | 0 |
| Bolsa Chica Water Company | County of Orange | 94 | 0 | 0 |
| R.j. Noble Company | County of Orange | 90 | 0 | 0 |
| Carry Tract Water Assoc | County of Orange | 90 | 0 | 0 |
| County of Orange | 80 | 0 | 0 | |
| John Van Ruiten | County of Orange | 75 | 0 | 0 |
| Garrett Apartments01 | County of Orange | 67 | 0 | 0 |
| Parkview Mutual Water Co Inc | County of Orange | 65 | 0 | 0 |
| Melvin Green | County of Orange | 65 | 0 | 0 |
| Liberty Park Water Association | County of Orange | 64 | 0 | 0 |
| C 0 John Wertin Development | County of Orange | 60 | 0 | 0 |
| Flying B Ranch | County of Orange | 60 | 0 | 0 |
| Irvine Ranch Headquarters | County of Orange | 60 | 0 | 0 |
| E E Kelly Pres/e Clark Main | County of Orange | 56 | 0 | 0 |
| Robert Garcia | County of Orange | 56 | 0 | 0 |
| Keesee Tank N Pump Co | County of Orange | 56 | 0 | 0 |
| Oceanview Mutual Water Co. | County of Orange | 50 | 0 | 0 |
| Mystic Oaks Camp | County of Orange | 50 | 0 | 0 |
| Ellen Mc Mahon | County of Orange | 50 | 0 | 0 |
| Forest Lawn Memorial Park | County of Orange | 50 | 0 | 0 |
| Anaco Ranch | County of Orange | 50 | 0 | 0 |
| Savanna Mutual Water Corp | County of Orange | 45 | 0 | 0 |
| Northrop Grumman Capistrano Test Site | County of Orange | 42 | 0 | 0 |
| Joe Agular | County of Orange | 42 | 0 | 0 |
| T V Apartment Motel | County of Orange | 40 | 0 | 0 |
| West Catherine Street Mutual W | County of Orange | 35 | 0 | 0 |
| San Juan Capistrano | County of Orange | 30 | 0 | 0 |
| Jack Larder | County of Orange | 30 | 0 | 0 |
| Eleanor Cunningham, Pres | County of Orange | 30 | 0 | 0 |
| Taormina Drive Water Supply | County of Orange | 30 | 0 | 0 |
| Flabob Airport | County of Orange | 30 | 0 | 0 |
| Acacia Drive Water Company | County of Orange | 28 | 0 | 0 |
| Crescent Water Association | County of Orange | 25 | 0 | 0 |
| Rancho Mission Viejo | County of Orange | 25 | 0 | 0 |
| Frank Fossati | County of Orange | 25 | 0 | 0 |
| Church Of The Nazarene | County of Orange | 25 | 0 | 0 |
| Borden Water Company | County of Orange | 25 | 0 | 0 |
| Airport Cafe | County of Orange | 25 | 0 | 0 |
| Chili Products Div Of | County of Orange | 25 | 0 | 0 |
| Crosby Water System | County of Orange | 25 | 0 | 0 |
| Crystal Ice Company | County of Orange | 25 | 0 | 0 |
| Hanson Water Company | County of Orange | 25 | 0 | 0 |
| Westminster Ceramics | County of Orange | 25 | 0 | 0 |
| O Neill Park | County of Orange | 25 | 0 | 0 |
| Michael Anthony/donald Brown | County of Orange | 25 | 0 | 0 |
| Standard Oil Co Pipeline Dept | County of Orange | 25 | 0 | 0 |
| Trabuco Fire Station | County of Orange | 25 | 0 | 0 |
| Bob & Jeans Cafe | County of Orange | 25 | 0 | 0 |
| Ocean View School District | County of Orange | 25 | 0 | 0 |
| Whitaker Water | County of Orange | 25 | 0 | 0 |
| Marvin Ross, Mgr | County of Orange | 25 | 0 | 0 |
| Ida M Rannow | County of Orange | 25 | 0 | 0 |
| Farmers Produce | County of Orange | 25 | 0 | 0 |
| Gay Mutual Water Co Inc | County of Orange | 25 | 0 | 0 |
| Santiago Mutual Water Assoc | County of Orange | 21 | 0 | 0 |
| Usfs San Juan Fire Station | County of Orange | 20 | 0 | 0 |
| G F Vanderwall | County of Orange | 20 | 0 | 0 |
| John R Thornton | County of Orange | 18 | 0 | 0 |
| Smith Water Company | County of Orange | 15 | 0 | 0 |
| Lazy W Ranch Water System | County of Orange | 12 | 0 | 0 |
| Alta Vista Country Club | County of Orange | 10 | 0 | 0 |
| Palms Cafe | County of Orange | 7 | 0 | 0 |
| Urban Residential & Educationa | County of Orange | 2 | 0 | 0 |
| County of Orange | 1 | 0 | 0 | |
| San Juan Basin Authority | County of Orange | 0 | 0 | 0 |
| Joint Regional Water Supply System | County of Orange | 0 | 0 | 0 |
| East Orange County Wd - Wz | County of Orange | 0 | 0 | 0 |
| Community Water Supply Assn | County of Orange | 0 | 0 | 0 |
| Haldor Place Mwc | County of Orange | 0 | 0 | 0 |
| Midway Trailer City | County of Orange | 0 | 0 | 0 |
| Fairlane Mobile Lodge - Inactive | County of Orange | 0 | 0 | 0 |
| Municipal Water District Oc | County of Orange | 0 | 0 | 0 |
| Orange Park Acres Mwc | County of Orange | 0 | 0 | 0 |
| Irvine Ranch Water District-llc | County of Orange | 0 | 0 | 0 |
| Southern Calif Wc - Lemon Hght | County of Orange | 0 | 0 | 0 |
| Irvine Ranch Water District-los Alisos | County of Orange | 0 | 0 | 0 |
| Irwd - Santiago System | County of Orange | 0 | 0 | 0 |
| Usn Naval Weapons Station | County of Orange | 0 | 0 | 0 |
| Leda Lane Mutual Water Co | County of Orange | 0 | 0 | 0 |
| Sea Aira Mobile Estates | County of Orange | 0 | 0 | 0 |
| Moore Mutual Water System Inc | County of Orange | 0 | 0 | 0 |
| Lolita Gardens | County of Orange | 0 | 0 | 0 |
| Fountain Valley | County of Orange | 0 | 0 | 0 |
| Bit-o-home Trailer Park | County of Orange | 0 | 0 | 0 |
| Dalewood Mutual Water Assn | County of Orange | 0 | 0 | 0 |
| Americana Mobile Home Park | County of Orange | 0 | 0 | 0 |
| Blue Seal Laundry | County of Orange | 0 | 0 | 0 |
| Cal-compact Foods | County of Orange | 0 | 0 | 0 |
| Houston Ave Water Company | County of Orange | 0 | 0 | 0 |
| Magic Lamp Mobilehome Club | County of Orange | 0 | 0 | 0 |
| Town & Country Villa | County of Orange | 0 | 0 | 0 |
| Old Pirate Lane Water Co | County of Orange | 0 | 0 | 0 |
| Tract 1322 Water System Inc | County of Orange | 0 | 0 | 0 |