Marble Hill is classified as achieving Excellent Water Quality in 2025 based on the assessment of bacteriological results for the period 2022 to 2025. Marble Hill has achieved an Excellent Water Quality rating for the four consecutive years 2022 to 2025. Annual water quality ratings are generally calculated using monitoring results over a four-year period and are assessed against stringent bacterial limits to protect bather health.

Marble Hill beach consists of a sandy beach with two rock outcrops at the east of the beach. These are exposed at times during the tidal phase during the day. Marble Hill beach consists of sand dunes which support a vast variety of plant species. There is also a wide variety of wildlife at Marble Hill beach. It is part of the Sheephaven SAC. This northern site is of high conservation value because of the extensive area of relatively unspoilt coastal habitats and the range of plant and animal species that these habitats support. Activities at Marble Hill beach include swimming, kayaking, boating, windsurfing and other land-based activities such as football, kite flying, etc. The bathing area is designated and is approximately 0.4415km2 and the extent along the water is approximately is 1330m. The depth of the water on the shoreline increases within 2 meters off the shore to a depth of 1 meter and gradually increases to greater than 2 meters with the slope of the shore.