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In rural residential and agricultural areas, sources of fecal pollution may include human waste (poop) from improperly functioning septic systems and animal waste from farms, pets, and wildlife. In more urbanized areas, human waste sources can include leaking sewer pipes, sanitary sewer pipes cross- connected with storm sewer pipes, and homeless encampments. In urban settings, animal waste pollution sources include dog poop left on trails, sidewalks and lawns, and un-naturally high concentrations of urban wildlife (e.g. raccoons, rats, etc.) attracted by human-sourced food.
As rainfall or snowmelt moves over the ground, the runoff picks up and carries with it human-made and natural pollutants. Fecal bacteria washes from the land into catch basins or into ditches and creeks that flow through our communities. The pollution flows to bigger streams and rivers, and eventually empties into our bays and harbors where people work, play and harvest shellfish.
Water carries many kinds of pathogens, including bacteria, viruses and protozoa. Each type of bacterium, virus or protozoan requires a different test. Many of these tests are expensive because they require special materials, equipment and/or are time-consuming. It is difficult to monitor water for every pathogen on a routine basis.
In the Nooksack River, wastewater treatment plants (WWTPs) are not a likely source contributing to increased fecal coliform levels.
WWTPs at Everson, Lynden and Ferndale have Individual National Pollutant Discharge Elimination System (NPDES) permits to discharge to the Nooksack River. Permits require that WWTPs regularly monitor effluent for several parameters, including fecal coliform and specify a monthly geometric mean limit (28 CFU/100mL) for the treated water that empties to the Nooksack River. The WWTPs all comply with their permits.
Washington State Department of Ecology (Ecology) accredits the WWTP labs that analyze samples. An Ecology permit manager monitors required monthly reporting, annually inspects facilities, and verifies sampling results through duplicate samples analyzed elsewhere.
Several factors support that pollution sources originating in the Nooksack River watershed are the primary cause of high fecal coliform bacteria levels in Portage Bay. About 5.26 square miles of Lummi Reservation land area drains to Portage Bay. The Nooksack River watershed is about 786 square miles and produces substantially more storm water. The prevailing wind direction from the east southeast and low salinity levels often measured in the marine water of Portage Bay indicate that Portage Bay is heavily influenced by the freshwater flowing from the Nooksack River. Studies summarizing data include http://lnnr.lummi-nsn.gov/LummiWebsite/userfiles/1_2000_to_2001_Final_DWIF.pdf and the Nooksack River Bacteria Total Maximum Daily Load documents accessed from http://www.ecy.wa.gov/programs/wq/tmdl/NooksackTMDL.html.
Approximately 400 residences are located on the Lummi Nation land area that drains to Portage Bay. The Lummi Tribal Water and Sewer District provides sewer services to 380 homes; 20 homes have on-site sewage systems (OSS). The Northwest Indian Health Board regulates the 20 OSS. The Lummi Gooseberry Point WWTP discharges effluent to an outfall located in Hale Passage. Washington Department of Health studies have confirmed that Gooseberry Point WWTP discharges do not reach Portage Bay.
Wildlife, including birds, can contribute fecal coliform bacteria to our waterways. Examples may include waterfowl that seasonally visit agricultural fields in Whatcom County and potentially contribute fecal coliform bacteria pollution to water that drains from the fields. Wildlife such as raccoons or rats can be a pollution problem when animals become concentrated in unnaturally high numbers in an area due to food sources made readily available by people (e.g. pet food outdoors or uncontained garbage).
Several misconceptions exist about using DNA testing, or Microbial Source Tracking (MST), to find the source of fecal pollution. One mistaken belief is that a single water sample can point out which specific person or animal is causing the pollution.
Current science is not capable of identifying all sources of fecal bacteria in a water sample. Analysis looks for genetic markers for certain species, but we do not have markers for all species. Even if a lab develops a marker for a certain species, not all individuals of that species may carry the marker. MST strategies rely on establishing patterns based on multiple samples taken over time from specific sampling locations. A limited number of labs are qualified to conduct MST analysis and costs are high.
Past MST studies in Whatcom County’s Drayton Harbor watershed and in Skagit County’s Samish watershed confirmed already suspected fecal pollution from humans and from ruminants (cows, horses, and sheep) among other unidentified sources. Fecal pollution to water from human, livestock, and pet sources is preventable. Finding and fixing those sources provide the opportunity for improving water quality to healthy conditions.
•The US Environmental Protection Agency and Washington Department of Ecology (ECY) have authority to enforce rules related to water quality protection through the federal Clean Water Act. ECY enforces Washington’s Water Pollution Control Act. •The Washington State Department of Agriculture has authority related to water quality protection for licensed cow dairies. •Washington Department of Health (DOH) and Whatcom County Health Department have authority to enforce health and safety regulations related to on-site sewage systems and drinking water. DOH administers the National Shellfish Sanitation Program and regulates shellfish harvest in Washington. •Whatcom County Planning & Development Services regulates land use, such as enforcing the Critical Areas Ordinance and approving farm plan applications submitted for compliance.
Agencies such as Whatcom County Public Works Department (Public Works), Whatcom Conservation District (WCD), and USDA Natural Resources Conservation Service (NRCS) do not have authority to enforce regulations. Public Works gathers and analyzes data to prioritize pollution reduction efforts and coordinates landowner contact in the County’s Pollution Identification and Correction (PIC) program focus areas. Related to reducing bacteria pollution from livestock and manure, WCD and NRCS serve important roles in providing no-cost, expert advice and planning services for residents who want to benefit from the free help.