Both mean effluent is reaching the surface instead of soaking into the soil. Bright green strips show where nutrients are surfacing. Standing water means the field is saturated. Keep people and pets off it and get it inspected.
More detail
Surface symptoms are drain-field symptoms, and they read differently from anything happening inside the house. A leach field is supposed to disperse effluent into soil below grade where it filters and disappears. When it appears at the surface, the soil is no longer accepting it. Bright green grass in strips or a rectangle is the mildest version. It marks where nutrient-rich effluent is reaching the root zone, and the strips usually trace the lateral lines exactly. On its own it can mean the field is running near capacity rather than failed. Standing water, soggy ground that never dries between rains, or a sewage smell outdoors is further along. At that point effluent is surfacing rather than dispersing, which is both a health exposure and a sign the field is at or past the end of its service life. Untreated effluent at the surface is a contamination concern for people, pets, and any nearby well. The common causes are biomat overgrowth sealing the trench walls, which is the natural end of a field's life, hydraulic overload from too much water for the field's design, root intrusion, or soil compaction from vehicles or livestock driven over the field. Ground conditions matter here. Central Ohio sits on flat-lying glacial till with dense clay subsoils that drain slowly and perch water above the till rather than letting it through. That is why a field that performs adequately for two decades can fail relatively quickly once the soil's acceptance rate drops. One thing that is not the answer: pumping the tank. It empties the tank and buys days, and the field is the thing that has failed. Repeat pumping to control a surfacing field is a symptom of that, not a fix.