P-Man,
Can only speak to what I went through, but this was for a construction loan. I had coliform in my well and could not obtain approval from the health dept. to obtain my CO and subsequent final draw. After failing twice, I ran the water semi-consistently for 12 hours (every sink, shower, hose), purchased a filtration system for an unrelated iron issue (circa $1000 last year), and finally passed on the third attempt.