whete can i get my water tested?

concerned about water in my Hang Dong home. relying exclusively on closed submersible well for bathing, washing dishes, washing clothes.

is there a government agency which will test water for lead, etc.?

is soda ash injection treatment for high lead levels available in Chiang Mai?

Lead whilst found in the environment in small quantities is not so readily found in well water.The main source of contamination is old led pipes and copper pipes using lead based solder.If you look on greensides map of Chiang Mai pinned topic you will find an entry for water testing.CMU does it too, costs I believe about 6k.

Injection of any chemical into a flow requires a complex set up using metering pumps and monitoring equipment great for industrial use, pools, pollution control totally useless for a domestic environment.