campaign    source  color   CFU_per_100ml
2016-10-25  wwtp    blue    13500
2016-10-25  wwtp    grey    11300
2016-10-25  wwtp    other   37000
2016-10-25  river   blue    4020
2016-10-25  river   grey    4450
2016-10-25  river   other   3100
2016-11-22  wwtp    blue    16500
2016-11-22  wwtp    grey    4500
2016-11-22  wwtp    other   3380
2016-11-22  river   blue    578
2016-11-22  river   grey    55
2016-11-22  river   other   493
2016-12-13  wwtp    blue    8250
2016-12-13  wwtp    grey    4000
2016-12-13  wwtp    other   2000
2016-12-13  river   blue    1150
2016-12-13  river   grey    550
2016-12-13  river   other   1100
2017-02-14  wwtp    blue    38000
2017-02-14  wwtp    grey    3500
2017-02-14  wwtp    other   11500
2017-02-14  river   blue    1530
2017-02-14  river   grey    135
2017-02-14  river   other   168