Mill and Dividing Creek Bacterial Monitoring 2014 Enterococci cfu/100 ml

  5/21 5/28* 6/4** 6/11*** 6/18 6/25 7/2 7/9**** 7/16^ 7/23 7/30 8/6 8/13^^ 8/20
M1 36 18200 2600 12380 440 1290 830 1600 6000 760 340 960 7100 240
M2 18 121000 1096 324 182 160 200 1390 7432 90 16 94 16900 48
M3 22 740 476 74 24 6 18 252 4724 12 6 4 9360 8
D1 14 200 1320 2652 56 180 232 1420 1900 620 136 852 24200 350
D2 16 220 652 312 24 28 30 490 3290 40 1 4 22400 28
D3 88 78 412 246 22 8 4 164 408 1 2 1 10944 10

*The Pump station at the head waters of Mill Creek experienced an overflow beginning 1020 pm on 5/27/14 of about 300,000 gallons.  There was also a rain event of 0.26" within 18 hours prior to water sampling

**Rain of between 0.64" fell within the 18 hrs prior to sampling.

*** Although the rain that fell in the 24 hours before sampling was less than 0.08", it was raining heavily just prior to and during sampling.

**** Rain up to 0.42" fell in the 24 hours preceding sampling.

^Approximately 2.1" of rain fell within the 48 hours prior to sampling.

^^Up to 7.5" of rain fell within the 24 hours prior to sampling.  Some areas reported even higher totals.

 

Enterococci are bacteria that are found in the GI tract of warm-blooded animals, which includes all birds and mammals.  Their presence in surface water indicates recent contamination with fecal waste.  Counts are expressed as cfu or colony-forming units.  Counts greater than 104/100 ml are shown in red as they indicate that water is not suitable for recreational use. 

Water samples are collected and analyzed by Sally Hornor and her students at Anne Arundel Community College. 

This work is funded by Anne Arundel County Dept. of Public Works.

 

 M1 and D1 are the furthest upstream tidal stations in Mill and Dividing Creeks while M3 and D3 are the furthest downstream stations.  Results are now posted on a larger map, click here for the map. 

These data may not be used in another publication without written permission of Sally Hornor.

Sally G. Hornor, Prof. of Microbiology, AACC Environmental Center  410 777 2842, sghornor@aacc.edu