Unterbacher See Sued

Germany Lake 1 - Excellent

Unterbacher See / Süd is an artificial lake located in Düsseldorf, North Rhine-Westphalia. The bathing water has received an excellent classification for four consecutive years (2020–2023). The lake covers 87.6 hectares with a mean depth of 4.9 metres and a maximum depth of 13.4 metres. Water transparency is consistently 2.5 metres, and the lake is fed by groundwater flowing in a north-south direction.

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Water

Artificial lake covering 87.6 hectares. Mean water depth 4.9 metres, maximum depth 13.4 metres. Water temperature ranges from 14.6 °C to 23.1 °C (mean 20.1 °C). pH ranges from 6.4 to 7.8 (mean 7.4). Conductivity ranges from 370 to 435 µS·cm⁻¹ (mean 419 µS·cm⁻¹). Water transparency is 2.5 metres. Water body is stratified with sandy and silty substrate. Water exchange time exceeds 30 days. Eutrophication level is mesotrophic. Water level fluctuations reach 1.5 metres.

Location

The bathing area is located in Düsseldorf at the southern shore of Unterbacher See. The beach section extends 280 metres, comprising 133 metres of textile beach and 147 metres of naturist beach. A circular walking path runs approximately 10–20 metres from the shore.

Facilities

Lifeguard presence not specified. Toilets available at north and south beaches. Disabled access not specified. Swimming and non-swimming areas at the south beach are separated by a chain barrier. Facilities include campsites (north and south), restaurants, and a sailing school.

Water Quality

Bathing water quality classification: Excellent (2020, 2021, 2022, 2023). No relevant pollution sources have been identified. No microbiological, chemical, or other contamination in sediments. No effluent from municipal treatment plants, industrial treatment plants, septic tanks, or combined sewer overflows enters the water. Wastewater from facilities (campsites, toilets, restaurants, sailing school) is discharged to the public sewer.

Risks

Occasional cercariae (duck-lice causing swimmer's dermatitis) occur with low to moderate complaint frequency. Waterfowl (geese) cause temporary contamination of grassy areas and walkways with droppings, removed daily as needed. No cyanobacterial blooms observed in the past four years and no risk of future mass development. No macroalgae or phytoplankton mass development detected or anticipated.