You may not believe the reply, but it's worth the read. Why? It's true
 

" They've been doing some work on the golf course in our neighborhood I wonder if maybe something got in the line?"

What got in to the sprinkler system water line on the golf course is fertilizer. Massive liquid fertilizer tanks have been installed on new concrete pads adjacent to some of the pump stations that bring water up from the lakes. Trees were planted around them during the last week or so to hide the tanks and hide...well, you know, what needs not to be seen or asked about.
The liquid fertilizer concentrate is mixed with the lake/preserve water at the pump station and then pumped through the sprinkler system on to the golf courses, nearby green areas, the roads, car paths etc,.
Federal deregulation of restrictions on water and chemical usage on golf courses took place last month. I guess that didn't make the news.
Couldn't say where the chemicals go in the run off into watershed, ponds, lakes or effect on wildlife both in the water and around it.
Also don't know about what occurs due to overflowing the soil capacity, like when the sprinklers runs in the rain storms to reduce the water level in the ponds.
I could not venture to say how your home water was effected, but I also use a gallon or two a month with CPAP and enjoy the ease and low cost of the store purchase when needed.

I change mine every 12 months. Filter 2 and 3 look new.

Ohiobuckeye
 

Yes, you’re right, it was worse in summer. I did drink it once in a while but not right from the kitchen sink, I ran mine through a pitcher filter, then I could tolerate it.