WSSC Water Quality Monitoring
Here are the Fall 2009 results of WSSC's fecal bacteria monitoring tests which are required by the consent decree. In this sampling Sligo Creek had the two sites with the highest levels of bacteria of any monitored. These results are from this WSSC report.
Note: An amended version of the report was released by the WSSC in March 2010. The testing lab reported amended values for the Horsepen upstream site and both Northeast Branch sites.
September 21, 2009 |
The Maryland state standards for Enterococci bacteria:
|
| Stream Site | Fecal Bacteria Results Enterococcus CFU/100mL | Bacterial Source Testing | ||||||
|---|---|---|---|---|---|---|---|---|
| Human | Avian | Canine | Deer | Horse | Miscellaneous Wildlife | Non-human Unknown | ||
| 1). Northeast Branch (downstream) | 15 | 3% | 35% | 10% | 4% | - | 35% | 13% |
| 2). Lower Anacostia (downstream) | 30 | 6% | 41% | 7% | 13% | - | 26% | 7% |
| 3). Northwest Branch (downstream) | 65 | 0% | 35% | 8% | 7% | - | 27% | 23% |
| 4). Piscataway (upstream) | 98 | 7% | 32% | 9% | 11% | - | 26% | 15% |
| 5). Cabin John (downstream) | 110 | 8% | 35% | 13% | 0% | - | 29% | 15% |
| 6). Indian Creek (downstream) | 120 | 0% | 32% | 10% | 11% | - | 33% | 14% |
| 6). Seneca Creek (downstream) | 120 | 11% | 27% | 13% | 10% | 11% | 19% | 9% |
| 8). Rock Creek (upstream) | 128 (124) | 0% (0%) | 34% (36%) | 14% (15%) | 13% (12%) | - | 19% (18%) |
20% (19%) |
| 9). Upper Beaverdam Creek (upstream) | 138 | 6% | 32% | 13% | 10% | - | 23% | 16% |
| 10). Northeast Branch (upstream) | 143 | 0% | 31% | 13% | 16% | - | 25% | 15% |
| 11). Broad Creek (upstream-Henson Creek) | 162 | 10% | 36% | 15% | 13% | - | 16% | 10% |
| 12). Watts Branch (upstream) | 183 | 7% | 27% | 13% | 15% | 7% | 19% | 12% |
| 13). Western Branch (downstream) | 199 (193) | 36% (37%) | 23% (24%) | 9% (8%) | 11% (13%) | 4% (3%) | 12% (11%) |
5% (4%) |
| 14). Piscataway (downstream) |
200 (198) | 14% (14%) | 29% (29%) | 8% (8%) | 13% (13%) | - | 24% (24%) |
12% (12%) |
| 15). Lower Anacostia (upstream) | 205 | 13% | 39% | 10% | 6% | - | 21% | 11% |
| 15). Paint Branch (upstream) |
205 | 0% | 29% | 12% | 11% | 0% | 36% | 12% |
| 17). Paint Branch (downstream) | 225 | 0% | 33% | 9% | 13% | 9% | 24% | 12% |
| 18). Little Falls (downstream) | 237 | 14% | 28% | 15% | 13% | - | 19% | 11% |
| 19). Broad Creek (downstream-Henson Creek) | 245 | 7% | 35% | 13% | 12% | - | 19% | 14% |
| 20). Northwest Branch (upstream) | 260 | 11% | 29% | 17% | 9% | - | 24% | 10% |
| 21). Cabin John (upstream) |
270 | 19% | 29% | 10% | 12% | - | 17% | 13% |
| 21). Horsepen (upstream) | 270 | 6% | 31% | 9% | 13% | 12% | 18% | 11% |
| 23). Indian Creek (upstream) | 282 | 0% | 30% | 11% | 14% | - | 29% | 16% |
| 24). Oxon Run (downstream) | 283 | 11% | 27% | 11% | 9% | - | 30% | 12% |
| 25). Western Branch (upstream) | 285 | 33% | 21% | 8% | 7% | 0% | 21% | 10% |
| 26). Parkway (upstream-Walker Branch) | 303 | 10% | 28% | 12% | 17% | - | 19% | 14% |
| 27). Parkway (downstream-Bear Branch) | 355 | 13% | 29% | 13% | 11% | - | 22% | 12% |
| 28). Muddy Branch (downstream) | 360 | 0% | 36% | 6% | 11% | 9% | 27% | 11% |
| 29). Upper Beaverdam Creek (downstream) | 373 (390) | 13% (11%) | 29% (30%) | 11% (11%) | 14% (15%) | - | 23% (21%) |
10% (12%) |
| 30). Watts Branch (downstream) | 400 | 17% | 23% | 11% | 14% | 0% | 26% | 9% |
| 31). Little Falls (upstream) | 435 | 7% | 31% | 13% | 3% | - | 32% | 14% |
| 32). Muddy Branch (upstream) | 500 | 11% | 32% | 8% | 13% | 0% | 29% | 7% |
| 33). Rock Creek (downstream) | 507 | 16% | 33% | 8% | 9% | - | 21% | 13% |
| 34). Lower Beaverdam Creek (downstream) | 510 | 11% | 27% | 9% | 14% | - | 26% | 13% |
| 35). Seneca Creek (upstream) | 588 | 17% | 29% | 7% | 9% | 6% | 20% | 12% |
| 36). Oxon Run (upstream-Watts Branch) | 647 | 27% | 23% | 12% | 11% | - | 22% | 5% |
| 37). Horsepen (downstream) |
650 | 17% | 25% | 7% | 11% | 13% | 18% | 9% |
| 38). Lower Beaverdam Creek (upstream) | 662 | 31% | 20% | 8% | 13% | - | 16% | 12% |
| 39). Sligo Creek (upstream) | 848 (636) | 29% (26%) | 19% (21%) | 20% (14%) | 0% (10%) | - | 21% (21%) |
11% (8%) |
| 40). Sligo Creek (downstream) | 877 | 36% | 21% | 18% | 0% | - | 18% | 7% |
Numbers in parentheses() are results for field duplicate samples.