Giving local governments greater control over how to meet environmental targets is fiscally responsible because it promotes cost-effective choices that can be used to meet multiple local needs. The investment in BAT, which can easily cost more than $10,000 per system to install and more for ongoing maintenance, is only money well spent when it substantially improves water quality. Even though BAT is highly effective at removing nitrogen, for many locations, the nitrogen removed would never have reached a place where it could do harm. Much of the nitrogen that is released far from major water bodies gets removed by plants and bacteria before reaching the bay. Further, many local water quality problems, particularly the kind that cause swimming bans in lakes, are caused by phosphorus or harmful bacteria, neither of which are addressed by requiring that new systems use BAT.