You can look at a yard which appears aesthetically perfect to the untrained eye and not know anything about the soil underneath. Superficially lush green grass can be grown in relatively poor soil with limited nutrient availability by continuously pumping it with potent high availability chemical fertilizers and constant irrigation.
This is why many lawn care companies in Minnesota routinely offer programs with as many as seven visits over our short summer to apply these chemicals constantly as they wash out of our yards and into the groundwater and our river systems. This approach is not natural or sustainable, and arguably is not ethical.
There are several approaches which you can take to get out of this constant feeding cycle and bring your soil back to a healthier state where it can support truly healthy grass without the need for constant chemical inputs. Testing and understanding your soil, and building up it's organic matter content so that it can more effectively store and release nutrients and water are important.
It can also be useful to adjust the grass species and varieties in your lawn according to your soil and situation, and work over time to adjust these. Working with less frequent but more thorough irrigation cycles can help your grasses grow longer and deeper roots which will help keep everything greener for longer during dry periods. There are supporting biological treatments which can help your individual grass plants adapt their root system more quickly.
There are many resources available online and lots of research ongoing all over the country. Working with organic lawn care professionals you can assess your grasses and your soil and build an organic fertilization program that will build your fertility and improve your greenness over time.
This doesn't just mean switching out the chemical fertilizer for an organic one, although that's probably always a good first step. That alone is not an organic lawn care program though, particularly if you continue to apply toxic chemical pesticides instead of moving to organic weed control too.