If the expansion went ahead, the trust called for strict monitoring of the springs to make sure the power station did not affect the composition, temperature or pressure of the water.
The trust also wanted full membership of the peer review panel and staging of the project over a five-year period.
Trustee Amokura Kawharu, a law lecturer at Auckland University, told the hearing the hot springs had been known for their curative powers, as well as for cooking and heating, since the 16th century.
No natural resource had greater significance to Ngapuhi than Ngawha Waiariki and the springs.
Ms Kawharu also called on Top Energy to provide "material cultural benefits" to balance the negative cultural effects of exploiting the geothermal field.
She proposed the company meet the costs of a planned upgrade to the hot pool complex as a return benefit to the trust for the people it served.
Top Energy is not commenting until the hearings are complete. The commissioners are expected to release their decision next month.
Early last year, the Parahirahi C1 Trust disclosed plans for a $2.5 million upgrade of the pools, including a revamp of the rundown facilities and a barrier to protect the complex from floods.
As part of its expansion plans, Top Energy has bought the adjacent farm and Ginns Ngawha Spa, another hot pool complex across the road from Ngawha Waiariki.
Ginns is currently closed for renovation.