Are you looking to acquire a lake or pond?
You probably would not buy a house without carrying out a building survey, or buy a car without knowing it was mechanically sound. So buying or leasing a lake without undertaking a survey of the water chemistry is really not an option. If excess nutrients, such as phosphorus have entered the lake, you could be inheriting serious problems at some point in the future.
A water chemistry survey means you are aware of potential problems and can factor in remedial work and fishery management costs into your budget. It also means you are fully informed and in a stronger position when it comes to negotiating financial terms with the lake owner. Knowledge of the water chemistry will also give you an idea as to whether an increased level of insurance is needed for the fishery in question. Hence a survey not only makes environmental sense, but financial sense also.