How do you illegally attach a garden hose to a building? They punch a hole in the wall & run a hose through it? That's what it sounds like. I live in a state were we have Constitutional & Open Carry of garden hoses. So I'm a bit confused.
But, God forbid you hook up a garden hose illegally...
Were they stealing water from a neighboring business?
Another possibility: hose was leaking and there was a mandate to conserve water.