Lahinch is classified as achieving Good Water Quality in 2025 based on the assessment of bacteriological results for the period 2022 to 2025. Lahinch has achieved a Good Water Quality reating for 2025 and an Excellent Water Quality rating for the 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.

Lahinch is a sandy beach, subject to strong waves and strong currents. There is a defence barrier consisting of large boulders to prevent coastal erosion. Below the rocky defence barrier the bathing area is sandy with the absence of vegetation. Activities include surfing, kite surfing, wind surfing, horse riding and angling. The use of personal watercraft and fast power craft is prohibited. Beach bye-laws are in place with horse riding and dogs prohibited between 11am and 6pm during the summer season.