Torts of that kind are long and well established. You cannot harm your neighbor’s property. The EPA is redundant when you have a functioning justice system.
Even if we had "a functioning justice system," it is absurd to demand that neighboring homeowners sit by and wait for their property to be damaged or destroyed by a party's illegal actions.
And further absurd to demand that the injured party pay big $$$$ to lawyers to sue, after the damage has been done. As well as be forced to wait years and years for a settlement or award that may never be realized.
On the other hand, it is not absurd to seek a stop work order to STOP the damage being done by the illegal alterations to the property. And it is to the benefit of us all that we PREVENT the need for litigation.