I would recommend calling the water corporation fault number and stating your fault.

They may advise that there cleaning the fire main out or doing service work in the area that is scouring the line. In turn this lifts the sediment in the pipe line that services your house. They will prove you with sample jars or take a sample them self's. Often they will send a tech out and flush the main line, some times this makes it worse for a few days then becomes better.

Another place to look is your hot water system. if its a solar / gas unit some have an anode this may be braking down and contaminating the hot water line.

also heads up
DO NOT remove the water meter that enters your property to do a in coming water inspection. If a water corporation fitter comes to change it they strap a large copper cable across each side of the pipe work before they remove it.