By Phillip Tocco
Though not required by the Food Safety Modernization Act Produce Safety Rule, a water system map can be very helpful in an inspection. Here are some key features to include in a water system map.
Whether you are looking to create a food safety manual for a Good Agricultural Practices (GAP) audit or keep documentation for Food Safety Modernization Act (FSMA) compliance, a map of the whole water system is a good place to start. Many GAP audits require keeping a map of the water system. Though not required by the FSMA Produce Safety Rule, it can be very helpful in an inspection.
When creating a water system map, it’s important to remember that a water system begins with the water source and extends all the way to the last emitter. Delineate all blocks and separate units either on one big map or several small maps, depending on how detailed you want to be. The key should be to keep the map detailed enough to be of value to you.
On a water system map, key components to be labeled might include water sources, locations of backflow preventers, potential sources of contamination, pressure sensors and locations where hydrants connect to and terminate on the distribution system.
Water sources. Include all wells, ponds and streams where irrigation and crop water are taken from. If there is a special name for a water source that is used by the farm for water testing, recordkeeping purposes, or to communicate to other farm employees who are irrigating from that source, make sure to include that on the map.
Backflow preventers. Indicating where check valves or air gaps are located can be important to help other farm employees quickly find them for testing. It also helps you clearly double check that no cross connections or points of potential contamination occur between the source and the check valve. It might also be helpful to indicate if check valves are buried or above ground.
Sources of contamination. Potential sources of contamination include mixing and loading pads, composting areas, manure lagoons and chemical or fuel storage. Having these clearly indicated on the map can allow you to prioritize those areas for greater care.
Pressure sensors. In cases where there are multiple pressure sensors with each one monitoring a separate block, having each block mapped will help you locate where changes in pressure indicate line breaks or blocked emitters.
Hydrant connection points. Having these on a map can help you understand if the source is protected against backflow of the hydrant, a potential source of contamination. In cases where these connections occur between a source and a backflow preventer, they can help alert you to areas where you can improve.