Table 1.
Summary of locations sampled in this study and their total bacterial and CRB counts.
| Sample | Location | Collection Date (D/M/Y) | Location Type | Coordinates | Total Bacteria (CFU/mL) | CRB (CFU/mL) |
|---|---|---|---|---|---|---|
| C | Carpinteria Salt Marsh a | 24/4/18 | Marine estuary | 34.401244, 119.5401337 | 5.1 × 103 | 5.2 × 103 |
| K | Kiddie Beach b | 7/5/18 | Beach harbor | 34.1601144, 119.2235778 | ≤10 | ≤10 |
| LAR | LA River c | 4/6/18 | Urban river | 34.156572, 118.291143 | 2.2 × 103 | ≤10 |
| CP | Cypress Park d | 18/6/18 | Natural creek | 34.167243, 118.962229 | 5.2 × 102 | ≤10 |
| SS | San Simeon Creek e | 24/6/18 | Coastal wetlands | 35.5971832, 121.1218039 | 1 × 102 | ≤10 |
| TL | Topanga Lagoon f | 23/7/18 | Natural pool | 34.038536, 118.583085 | 7 × 102 | ≤10 |
| BBL | Big Bear Lake g | 21/8/18 | Natural freshwater lake | 34.245278, 116.917086 | 8 × 101 | ≤10 |
| WL | Woodley Lake h | 18/3/19 | Reclaimed water | 34.175326, 118.472829 | 3.1 × 103 | 10 |
| RL | Reseda Lake i | 18/3/19 | Artificial lake | 34.188714, 118.534383 | 2.4 × 102 | 20 |
| MRP | Malibu Rock Pool j | 28/3/19 | Natural pool | 34.096555, 118.729879 | 1.1 × 102 | ≤10 |
a Estuary fed by the Franklin, Santa Monica, and San Simeon creeks. b Kiddie Beach (Oxnard marina) receives residential and military runoff water. c The Los Angeles River runs from Simi Valley, CA to Long Beach, CA, bisecting the city. The riverbed alternates between cement and natural dirt. Our sample was collected at Glendale Narrows, which is an area of restoration where cement was removed to expose the natural riverbed. d Our sample was collected at Arroyo Conejo Creek, which spans the entire Conejo Valley and is the only watershed for the entire valley. The area is highly residential. e The creek is a natural wetland that receives agricultural and residential runoff. f Lagoon that forms behind a beach berm after seasonal rains and is fed by the Topanga Creek. g Natural reservoir for the San Bernardino Mountains, it is filled solely by snow runoff. h Wildlife wetland and bird sanctuary that is filled with reclaimed water from the Tillman Water Reclamation Plant (DCTWRP). i Asphalt lined urban lake with potable water that is treated with an algicide. j Natural pool filled with rain runoff from the Santa Monica Mountains.