Sure, believe what you want to believe I guess. I don't really care. And I've owned a home for about 15 years.
I got a home equity loan recently and the credit union I went with used the value on the assessor's site for the loan to value calculation. Maybe that's not the norm, I don't know. But an acquaintance of mine had the same experience. It's a small sample size, so take it for what it's worth. I would bet that all lenders will require a private appraisal on a new mortgage though.
And here is some more info on equalization. If the county assessors let the value get way too high or way too low the Dept of Revenue comes in and gives them an equalization order. That's usually not ideal.
The Iowa Dept. of Revenue is responsible for “equalizing” assessments every two years. Read our explanation for how this works here & contact us with questions.
tax.iowa.gov