Q.3 feet tall Dwarf lemon tree
All leaves are turning yellow. It has plenty of flowers and lemons. We also have it connected to a drip system. Can you please give some advice? My husband tells me that it’s getting too much water.

Yellowing leaves can indicate a watering issue; too much or too little.
Here are some links that will help you.
https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm