Nitrate levels in excess of 2 to 4 ppm are often a result of fertilizer run-off from agricultural operations or from leaking septic tank systems. These automatic nitrate removal systems, properly sized and maintained, can reduce nitrate levels by 80%. In place of toxic chemicals these systems regenerate with common water softening salt. Sizing is important and a complete general mineral water analysis is recommended. Sulfates affect performance and it is important to know the sulfate levels in addition to the nitrate levels. The USEPA Maximum Contaminant Level allowed is 45 ppm. If nitrate levels in the raw water exceed 100 ppm, a new water source is recommended. Call AWS for specific recommendations and sizing options.Nitrate levels in excess of 2 to 4 ppm are often a result of fertilizer run-off from agricultural operations or from leaking septic tank systems. These automatic nitrate removal systems, properly sized and maintained, can reduce nitrate levels by 80%. In place of toxic chemicals these systems regenerate with common water softening salt. Sizing is important and a complete general mineral water analysis is recommended. Sulfates affect performance and it is important to know the sulfate levels in addition to the nitrate levels. The USEPA Maximum Contaminant Level allowed is 45 ppm. If nitrate levels in the raw water exceed 100 ppm, a new water source is recommended. Call AWS for specific recommendations and sizing options.