Seep/spring?

So we just bought a home with a little property in northern Arkansas. I myself am obsessed with gardening and homesteading and want a garden - our best garden spot we noticed the ground above it in a huge swath of about .2 acres is completely sodden and some of the earth has a sheen on top of it- the sheen does break up when stirred and disappeared when we started digging it)... we live near to the top of a ridge and on top of the ridge there is a suburban community. The home above us does have a septic system but said there leech field is about 160 feet away from where the water is seeping up. We do live in a mostly wooded area and our neighbor across the way has springs on his property not too far away. My questions-
Is this awesome and I could let this water my garden?
Should I be freaking out it’s contaminated?
What we dug our today looks totally clear and smells great...
I already ordered some well water test strips and some hydrocarbon test strips. Should this be sufficient?
What are some cool ideas for making this water source amazing ?
Thanks guys! I can’t wait to garden it’s pretty much my favorite thing ever ever ever.
Sage

I wouldn't catch the water and drink it and I wouldn't use it to water my lettuce/spray my lettuce and eat it. I would however feel okay using it to water my fruit and nut trees. I would also be okay building a ditch on contour to spread the spring water the width of my property to use it to sub-surface keep my property moist.

With this there are 5 contaminants.
1) Heavy metals during rain event having water sheet down to you. A ditch will stop them.
2) Nitrates/Phosphates/etc, this is really a blessing, keep it coming
3) Oil, pesticides, fertilizers. Fungi will degrade most/all of them, if you can contain the flow in a ditch.
4) Pharmaceuticals metabolites from whatever meds they are taking.This is my biggest worry.
5) Microbes and parasites. A ditch on contour that hold the water, will have these bad microbes eaten/killed/out competed.
 

What you describe as a "wet" area is likely a wetland area.  You could not use it for common agriculture (except maybe rice) unless you artificially drain it which may get you into trouble with the USACE and/or state regulators.  Your best bet would be to contact the local USDA NRCS office for direction and advice.  Also if you suspect you are seeing seepage originating from septic effluent, contact you local county sanitarian and have them conduct an onsite inspection.  They may even have  budget to conduct groundwater sampling and analysis to determine if there are household wastewater components in the wetland, ask them to look for MBAS (detergent additives) or possibly caffeine.   Good luck.