Hammonton Lake is a 65-acre recreational lake in New Jersey, USA. It is downstream of a wastewater treatment works and suffered from excessive levels of coliform bacteria. This caused the swimming beach to be shut to the public by the Health Department for 13 days in 2006 because the coliform cell count was above the 300 cells per ml public health limit at all other times.
On 19th July 2007, the solution program was commissioned. When the first post solution tests were done on July 23rd the coliform count was 180 cells per ml.
On the night of July 30th, a large storm created stormwater inflow to the upstream sewage works that “flushed” it out, sending the coliform count in the lake up to 1 621 on July 31st.