Volume 11, Number 2—February 2005
Research
Sporadic Cryptosporidiosis Decline after Membrane Filtration of Public Water Supplies, England, 1996–2002
Stella Goh*, Mark Reacher†
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
, David P. Casemore‡, Neville Q. Verlander§, André Charlett§, Rachel M. Chalmers¶, Margaret Knowles#, Anthony Pennington*, Joy Williams*, Keith Osborn**, and Sarah Richards††
Table A1
Water sources, water distribution zones, filtration, and populations served, Copeland and Allerdale Local Authorities, 1996–2002
| Water sources | Water zones | Filtration of water supplies | Average population |
|---|---|---|---|
| Crummock Lake | Crummock North Crummock South | Unfiltered March 1, 1996–February 29, 2000; membrane filtration from March 1, 2000, to August 31, 2002 | 58,295 |
| Ennerdale Lake | Ennerdale North Ennerdale South | Unfiltered March 1, 1996–February 29, 2000; membrane filtration from March 1, 2000, to August 31, 2002 | 47,780 |
| "Other*" | Millom Quarry Hill Hausegill Hayknott Underscar Bridgend Fellside Multiple sources Private | Conventionally filtered* throughout the study period (March 1, 1996–August 31, 2002) | 59,699 |
*A variety of conventionally treated and unfiltered water, and private supplies.
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