Portsalon is classified as achieving Good Water Quality in 2025 based on the assessment of bacteriological results for the period 2022 to 2025. Portsalon has achieved a Good Water Quality rating in 2025 and Excellent Water Quality rating for the three consecutive years 2022 to 2024. 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.

Portsalon beach consists of a sandy beach along the Swilly Estuary, sheltered to the south by the high rocky headland of Knockalla and contained to the north by flat land. These are exposed at times during the tidal phase during the day. Portsalon beach supports a wide variety of seabirds and wildfowl. The Horn Head to Fanad Head SPA is situated near to this beach. This 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. The catchment area is an idyllic location for bird watching and ecological activities. Activities at Portsalon Beach include swimming, surfing, wind surfing and other land-based activities such as football, kite flying, etc. The bathing area is designated and is approx. 0.588 km2 and the extent along the water is approximately is 3060 m. The depth of the water on the shoreline increases within 2 meters off the shore to a depth of 1 meters and gradually increases.