You have received some good advice from each of the above respondents. Pick out one or two items from each one of them and form a list of ideas.
You explain that the "HOA" property has -"5 large ponds, from 15 to 25 acres". even if each pond is just 15 acres that amounts to 75 total acres of productive water to be managed. A big, big job if it is done correctly. When each body of water is separate this makes the management even more complex due to the combined ecological diversity that is present in each different one.
ewest says - "that is way too much water to manage by yourself". IMO the best you can do is be the pond/lake leader, spokes person, educator, and guidance for the HOA. As forewarned - good lake management and knowledge is not cheap unless there are no goals for the water body. IMO just about everybody thinks pond management is easy and cheap. This is only true when one has no idea of the complexity of constantly changing systems that intertwine and function together underwater as a complete living ecosystem. Books and many articles are written about it.
I totally agree, you need help and be sure it is good help and better yet the Best Help especially you or the group is not well experienced in dealing with how best to recognize and deal with all the different problems that can be created by five different bodies of water. ALL PONDS ARE DIFFERENT DESPITE HOW SIMILIAR THEY APPEAR ABOVE THE SURFACE.
In my 40 years of professionally working with ponds - You don’t know what you don’t know.
Do your best to not pay the “dumb tax”. Dumb tax is having to later pay a costly amount for making an previous unwise decision or action aka a mistake. Usually everyone pays a “dumb tax”. Dumb tax can be very costly when dealing with large bodies of water. Sometimes it is very difficult to almost impossible to fix a really dumb action.
Two of the most important things that the lake association should do is: firstly do some due diligence for finding out who are the high caliber, well experienced, very knowledgeable pond management professionals available to your location for what the possibilities are and what the REALISTIC goals can be for the 5 pond / lake system. Just establishing and learning about some realistic, achievable goals for a prior built lake can be a real challenge to develop good practical GOALS from what is possible. Locate some pond/lake management professionals. Get a resume and a list of past projects and appropriate references. Very important - check the references and talk to the references. Not doing this usually results in paying the “dumb tax”. Just because he has a truck with a boat and chemical sprayer does not mean he is a well experienced and smart pond consultant. Know his history.
Second thing then is hire and LISTEN to and DO what the chosen one tells you to do. Or hire him/them to do the work. Know the up-front costs. Ask what to expect and what to get from their services. Ask if they are willing to stand behind their advice and work actions. Ask what happens if their management does not produce the agreed upon goals. Are there any guarantees? What happens when the plans / actions when paid for do not work as promised?
I wholly agree with ewest - contact our mentor Bob Lusk. You can and probably should contact a second professional for 2nd opinion. Bob Lusk is not just a professional pond / lake manager but one that is nationally recognized by the American Fisheries Society. Top notch. IMO - the best available and he is even based in your state of Texas.
Some Preparatory Homework from PBoss Magazine articles. These back issues of Pond Boss Magazine are available for purchase.
https://www.pondboss.com/back-issuesIf you live on a pond/lake you should subscribe to Pond Boss Magazine for up-do-date bimonthly arriving of - How to Reference Material.
Suggested reading from back PB issues.
Evaluating Your Pond. May-Jun 2021 pg 30-34. Lusk provides several ideas to analyze what going on and what to collect in a pond.
EVALUATING YOUR FISHERY. Jan-Feb 2023 Lusk tells how to make smart decisions for better management of your fishery. Focuses on being proactive, sizes classes, data collection and sampling.
MANAGING ESTABLISHED LAKES. May-June 2023. Lusk gives misconceptions, how to set goals, evaluate, being proactive or reactive. What to look for to better manage your older water body. Defines balance and how to begin seeing the “big 5” water, habitat, food chain, genetics, and harvest plan.
THE DUMB TAX. May-Jun 2022 pg 32-36. Lusk defines it by using 6 examples and gives ways to avoid getting the dumb tax.
NEW POND OWNERS HAVE A STEEP LEARNING CURVE. Mar – Apr 2020 pg6-8. Lusk tells ways to recognize your knowledge limits.
Jan-Feb 2019
YOUR POND’S PURPOSE. Lusk points out some helpful goals for a pond.
STATUS QUO. Lusk every pond decision and action creates reaction. Make them work toward your goals.
Bob Lusk has a magazine article dealing with Home Owners Associations, however I looked & looked and could not find that article.