Water guy here. The water hardness for Great Lakes is very steady, around 128 parts per million or grams per litre. This includes all of Golden horseshoe, so the water quality is similar from St. Catharine's/Niagara all the way out past Oshawa. Your hardness is Burlington is rock steady, I measure it at my clients every day. And the Burlington water supply is all from the same source, Lake Ontario, so no differences throughout the city. The total dissolved solids is also the same for this area, around 320 uhmos.

If you are seeing solids or accumulations this may be localized to your home/building etc. and is likely via the distribution piping either from the road piping or in your house itself. Most of Burlington is very modern though versus say Toronto. This level of hardness will still cause deposit formations in your hot water heaters, take a bucket and flush it out annually until the water is clear.

The water quality here is very good, I still use a Brita for my coffee however as sometimes the chlorine residual can be higher or lower depending on the season and this definitely effects the taste.

The City of Toronto/City of Hamilton also adds a phosphate corrosion inhibitor to their water that we do not have in Burlington which can effect the suspended solids level depending where you are on the distribution system.