First instance I have come acrross of performance based septic systems being required

Salt load in land applied waste water is considered by many to be the single most important challenge facing the industries which use land application to treat waste water. Particularly sensitive to this issue are briners, cheese processors and some electronics manufacturers. Among waste water spray field management advisers the consensus is that saline waste water spray field operations should avoid sites where the discharge can't be diluted by substantial rainfall and/or groundwater flux. In short, dilution is the only practical solution when it comes to salts in waste water.