Apparently the pex absorbs chemicals.

‘Winterization MoldCrime, heat index, walkability, schools AsbestosPoor location, busy street, etc.TermitesDryvit, synthetic stuccoUrea formaldehyde foam insulation (UFFI)RadonNo parkingAge of propertyOld or no windows, unsecured building (SimpliSafe.com)Knob & tube electrical (60A), grounded outlets every 11’, GFI’sUnderground oil tanks, oil heatGravity or steam heat, octopusRoofing: Flat roofs, slag, slate, Yankee guttersPests: fleas, squirrels, bats, bed bugs, rats, etc.Chinese drywallNo firewallBelow sea level, slabLead paint (prior to 1978)>60% rehab, new construction guidelines & building codes (i.e.

The chemical smell should be minimal once the Cover has been off for a few minutes.

Plastic just doesn't hold up long term to high pressure and the types of chemicals most of us have in our water supply.Speaking of pressure, buy yourself a $10 water pressure tester from HD, and check your water pressure every six to twelve months.

Colorado requires cleaning whereas other states allow you to use chemicals that neutralize the meth.

Beyond smell, you're going to have a reasonable amount of heavy trucks bringing chemicals, septic haulers bringing in portable crap loads, solid waste cakes being hauled to the landfill or (worse) slurry land applied. 

Water systems require backflow on commercial & multifamily because there's greater chance for someone to create the conditions that might allow a backflow scenario to exist, i.e. a hose sitting in cleaning solution, or a chemical mixer attachment on a hose, wherein a drop in pressure on the city main could cause those materials to be drawn into the distribution system.

I forget the name of the additional chemical(s), but I will make sure to look for aproduct that addresses the eggs and larva as well - not all flea foggers do,from what little I`ve been able to research in the past couple of days.

While Nat Gas is odorless, they put in a chemical that smells.Call the Utility or HVAC or Plumber.

It is very important to use these cleaners only in very well ventilated areas as the chemicals are very strong.