If you find a leak in the house, determine where it is coming from. If it is from a toilet or under a sink look for the angle stops. If you cant find the angle stops look for a central valve box. It is like an electrical circuit breaker box, but for the plumbing system. It is common in newer homes in Clark County. If it isn't coming from a toilet or faucet with a shut-off under it, look for the whole house shut-off in the garage or outside. Here are some examples of what to look for.