First off who is your buyer's agent? If you are making the offer through the guy who's sign is in the yard you are making a big mistake, he/she is not your friend. They are working for the seller. If you have ever read the Colorado real estate contract required to list a home you would understand exactly how much loyalty he/she owes the seller.
If you had a competent buyer's broker you would not be on this site looking for advice from the rest of us. I guarantee you that my clients have never had to go to the social media to make sure they got a good deal on a home and had the home properly inspected.
For your well, get a professional water company to come out and do the testing. Yes, as some mentioned there are home inspectors that can draw a water sample and have it taken to the state lab and tested for potability. Big deal you can drink it... The state lab only tests for bacteria.
The wells in colorado can have a lot more in them than bacteria. I use Todd Hart, The water Guy, he will test everything from alkalinity, to radon in your well. Your are not goiing to get this service from any home inspection company.
I was a general contractor for years. Most home inspectors don't know there ass from a hole in the ground and could not find it with both hands and a flashlight. Get a good referral. I have few that I use because I know they are competent. If you had your own agent this should be a simple thing to do. A good home inspector will also do the radon testing
The well production test is important. You can only get this properly done with a state certified well company. To do it properly the well must be opened. Only a state licensed well contractor is supposed to open the well head. The well must be treated afterward for bacteria. A good well company will not only test the well to make sure it flows water (this is a two hour test), but they will run their probe that will give them feedback as to recovery rates and static water levels. Running the faucet for an hour doesn't cut it. You need to pull the original well file from state. This will have production rates from the day the well was first pumped. You want to compare the well production and static rates from then till now. A well that has slowed significantly is an indication the well is failing.
The septic should be pumped. We usually try to get the seller to pay for that (it is their poo). A licensed septic company should be able to perform a "NAWT" inspection. If they don't do that move on to the next guy. This certification is required by many counties prior to transferring the deed.
You should also have the septic line to the tank video inspected, although if the home is newer with PVC lines this is less important. We do see low spots in those lines though that can also cause backups.
Other items to consider
seller to have the furnace cleaned and certified
built before 1978 have Colorado Lead Safe Testing certify the home to be lead free. If you plan any remodeling this is very important.
chimney cleaned and inspected
I may be way off base, but is sounds to me like you need a good agent on your side. If you are in a contract with another agent this is not intended to be a solicitation.