Source Protection Zones: Merged Groundwater Safeguard Areas

Environment Agency groundwater flow models define three concentric protection zones around public drinking water sources based on 50-day and 400-day pollutant travel times. These merged, public-facing geospatial outlines remove overlapping boundaries to provide a clear map of regulatory constraints for land-use planning. The dataset serves as an initial screening tool to assess contamination risks to potable groundwater abstractions.

Use Cases

• Land-use planning and permitting decisions based on proximity to defined inner (50-day) and outer (400-day) protection zones.
• Environmental impact screening for proposed developments or activities near potable groundwater abstraction sites.
• Visualizing groundwater catchment areas (Zone 3) to understand the total area supporting a protected water source.
• Integrating regulatory constraints into hydrological or environmental risk models using the merged zone boundaries.

Strengths

• Based on detailed Environment Agency groundwater flow models incorporating parameters like flow direction, geology, and rainfall.
• Provides specific, scientifically-defined zone criteria (e.g., 50-meter minimum radius for Zone 1, 250/500-meter for Zone 2).
• Public-facing data has been processed to remove common boundaries and overlaps for clarity.

Limitations

• Critical metadata is missing or conflicting: no row count, column details, or license information is provided by any source.
• One source lists a future 'last updated' date (2026-03-20), which is inconsistent and suggests potential metadata errors.
• The dataset's spatial completeness is unclear; descriptions mention zones were 'extended' in some areas, but the methodology for this is not detailed.

Provenance

Source

Government Digital Service / Environment Agency (UK)

Collection Method

Created by applying Environment Agency groundwater flow models at abstraction locations, then merging and simplifying zone boundaries for public release.

Freshness

2026-03-20 15:09:58.945127 (Note: This is a future date, indicating a potential metadata error.)

Geography

Likely covers England and Wales, given the originating agency, but explicit geographic scope is not stated.