the railroad comissioner has more authority over oilfield matters such as tank trucks & such... 1 call to your local railroad comissioner is all it takes & they get rite on it... i got 1 stopped from dumping saltwater into a local stream... had the hose hung over a bridge lettin water out as fast as he could so i called & they came rite out... that stream went into the sabine river which holds many kinds of fish but no trout... fired, lost his cdl & had to pay 1 hell of a fine... however it is not illegal for tankers to suck water from a stream into the tanks...