Overflow history upstream of River Eden, Armathwaite

The spot's forecast · For event organisers

This page lists the monitored storm overflows upstream of this spot and how often each spilled in each year. It is not a water test, and it does not say whether the water is fit to swim in. It does not include farm runoff, misconnected drains, treated sewage effluent, wildlife or overflows without a monitor. A year's count depends on how long the monitor worked, shown as monitor uptime.

Each year, all overflows upstream

Year	Overflows with a return	Spills	Spill hours	Spill hours, weighted by reach
2021	52	2,493	17,614	2,596
2022	52	2,220	11,787	2,002
2023	58	2,530	17,723	2,398
2024	60	2,496	14,745	1,345
2025	60	2,068	10,889	1,278

Reach is the share of a spill's bacteria SwimSignal's model expects to arrive here, after die-off on the way and dilution by the river. Weighting by it counts an hour of spilling just upstream for far more than one 40 km away. Spills are counted by the Environment Agency's 12/24 method: any discharge in the first 12 hours counts as one spill, then one more for each 24 hours with any discharge. How reach is worked out.

The overflows, by reach

All 60, the one whose spills matter most here first. Hours away is how long sewage takes to arrive at the model's river speed.

Overflow and id	Company	km upstream	Hours away	Reach	Spills 2023	Spills 2024	Spills 2025	Spill hours 2025	Monitor uptime 2025
Kirkoswald sewage works overflow Kirkoswald WwTW · UUP01087	United Utilities	7.9	4	68%	15	27	40	95	100%
Behind Lager's Store storm overflow CSO behind Lager's Store · UUP00216	United Utilities	9.4	5	63%	53	36	68	68	100%
Lazonby pumping station overflow Lazonby PS and CSO · UUP01123	United Utilities	9.4	5	63%	81	48	40	60	100%
Little Salkeld sewage works overflow Little Salkeld WwTW · UUP01155	United Utilities	14.1	8	50%	164	101	118	1,014	97%
Great Salkeld sewage works overflow Great Salkeld WwTW · UUP00843	United Utilities	14.6	8	49%	70	56	38	148	100%
Langwathby sewage works overflow Langwathby WwTW · UUP01111	United Utilities	17.9	10	39%	65	54	28	271	100%
Langwathby storm overflow Langwathby CSO · UUP01110	United Utilities	18.6	10	37%	93	83	54	167	100%
Edenhall Village & Hotel sewage works overflow Edenhall Village & Hotel WwTW · UUP00687	United Utilities	20.3	11	35%	137	103	118	575	100%
Culgaith sewage works overflow Culgaith Wwtw · UUP02193	United Utilities	25.8	14	14%	–	48	30	233	100%
Culgaith sewage works overflow Culgaith WwTW · UUP00592	United Utilities	25.8	14	14%	0	21	9	48	100%
Penrith sewage works overflow Penrith WwTW · UUP01538	United Utilities	28.5	16	11%	21	13	25	248	100%
Penrith Outfall storm overflow Penrith Outfall CSO · UUP01535	United Utilities	29.9	17	11%	4	0	0	0	98%
Carleton Hall Templebank storm overflow Carleton Hall Templebank CSO · UUP00403	United Utilities	31.5	18	6%	124	127	95	606	99%
Bolton (Penrith) sewage works overflow Bolton (Penrith) WwTW · UUP00268	United Utilities	35.6	20	4%	88	67	54	156	100%
Sockbridge & Tirril sewage works overflow Sockbridge & Tirril WwTW · UUP01778	United Utilities	36.5	20	4%	42	41	38	103	100%
Lady Beck storm overflow Lady Beck CSO · UUP01096	United Utilities	36.5	20	4%	0	0	0	0	83%
Clifton (Penrith) pumping station overflow Clifton (Penrith) PS · UUP00507	United Utilities	33.4	19	4%	20	37	36	155	99%
Stainton storm sewage overflow Stainton SSO · UUP01834	United Utilities	38.0	21	4%	71	56	54	516	100%
Clifton pumping station overflow Clifton PS · UUP00503	United Utilities	34.7	19	4%	3	23	15	111	100%
Askham (Askhm) sewage works overflow Askham Wastewater Treatment Works (Askhm) (017670078) · UUP00148	United Utilities	38.2	21	3%	47	67	76	543	98%
Pooley Bridge storm sewage overflow Pooley Bridge SSO · UUP01560	United Utilities	42.0	23	2%	48	37	30	141	100%
Pooley Bridge East sewage works overflow Pooley Bridge East wastewater treatment works (Site ID Poole) (017670085) · UUP01559	United Utilities	41.7	23	2%	3	5	0	0	100%
Appleby Adj to Appleby sewage works overflow Appleby CSO Adj to Appleby WwTW · UUP00122	United Utilities	42.1	23	2%	46	34	20	89	100%
Appleby (Apple) sewage works overflow Appleby WwTW(Apple) (017670001) · UUP00124	United Utilities	41.9	23	2%	16	25	17	64	100%
Holme Street/Chapel Street storm overflow Holme Street/Chapel Street CSO · UUP00979	United Utilities	43.3	24	2%	11	12	7	3	100%
Kirkby Thore pumping station overflow Kirkby Thore PS · UUP01081	United Utilities	33.8	19	2%	39	42	30	73	100%
Hunsonby storm overflow Hunsonby CSO · UUP01000	United Utilities	17.8	10	2%	0	0	0	0	100%
The College storm overflow The College CSO · UUP00565	United Utilities	8.7	5	2%	53	47	43	27	96%
Kirkoswald pumping station overflow Kirkoswald PS · UUP01088	United Utilities	8.9	5	2%	10	2	5	2	81%
Long Marton sewage works overflow Long Marton WwTW · UUP02270	United Utilities	37.6	21	2%	4	24	18	17	99%
Temple Sowerby sewage works overflow Temple Sowerby WwTW · UUP01906	United Utilities	27.8	15	1%	181	184	123	380	100%
O/S Fawell House storm overflow O/S Fawell House CSO (174LB) · UUP02231	United Utilities	27.8	15	1%	–	70	2	3	85%
Winskill pumping station overflow Winskill PS · UUP02148	United Utilities	18.1	10	1%	5	5	4	8	100%
Renwick storm overflow Renwick CSO · UUP01646	United Utilities	13.9	8	1%	20	17	14	3	100%
Glassonby Village sewage works overflow Glassonby Village WwTW · UUP00799	United Utilities	12.8	7	1%	192	78	82	173	90%
Chapel Street (Temple Sowerby) storm overflow Chapel Street (Temple Sowerby) CSO · UUP00446	United Utilities	28.8	16	1%	38	42	27	26	100%
Melmerby sewage works overflow Melmerby WwTW · UUP01282	United Utilities	22.0	12	1%	10	9	0	0	100%
Sandford Village sewage works overflow Sandford Village WwTW · UUP01711	United Utilities	53.0	29	1%	34	33	25	33	100%
Skirwith pumping station overflow Skirwith PS · UUP01767	United Utilities	22.9	13	1%	5	4	7	14	100%
Skirwith Hall storm overflow Skirwith Hall Combined Sewer Overflow · UUP01766	United Utilities	23.8	13	<1%	9	13	4	3	96%
Manhole on Syphon (Warcop) storm overflow Manhole on Syphon (Warcop) CSO · UUP01241	United Utilities	55.0	30	<1%	81	73	53	258	100%
Gamblesby pumping station overflow Gamblesby PS · UUP00770	United Utilities	16.2	9	<1%	36	27	25	90	100%
Warcop Village pumping station overflow Warcop Village PS · UUP02256	United Utilities	54.8	30	<1%	87	80	54	356	100%
Blencarn sewage works overflow Blencarn WwTW · UUP00257	United Utilities	26.5	15	<1%	14	44	30	196	100%
Unthank pumping station overflow Unthank PS · UUP01979	United Utilities	16.8	9	<1%	20	29	11	28	100%
Glenridding sewage works overflow Glenridding WwTW · UUP00808	United Utilities	55.0	31	<1%	36	38	82	144	100%
Castle Hill Drive storm overflow Castle Hill Drive CSO · UUP00421	United Utilities	32.9	18	<1%	0	0	0	0	99%
Sandgate (Penrith) storm overflow Sandgate (Penrith) CSO · UUP01712	United Utilities	33.5	19	<1%	22	10	0	0	100%
Arthur Street/Meeting House Lane storm overflow Arthur Street/Meeting House Lane CSO · UUP00136	United Utilities	33.6	19	<1%	1	1	0	0	93%
Junction of Wordsworth Street storm overflow Junction of Wordsworth Street CSO · UUP01045	United Utilities	33.7	19	<1%	5	5	2	0	89%
Gillwilly pumping station overflow Gillwilly PS · UUP01537	United Utilities	34.4	19	<1%	0	1	3	8	100%
Brougham pumping station overflow Brougham Pumping Station (17502) (EDE0085) · UUP00353	United Utilities	31.6	18	<1%	0	0	1	0	100%
Punch Bowl Hotel (Askham) storm overflow Punch Bowl Hotel (Askham) CSO · UUP01590	United Utilities	38.2	21	<1%	23	17	17	12	82%
Morland sewage works overflow Morland WwTW · UUP01342	United Utilities	36.5	20	<1%	120	135	107	456	100%
Murton sewage works overflow Murton WwTW · UUP01363	United Utilities	46.3	26	<1%	46	41	41	190	100%
Great Asby sewage works overflow Great Asby WwTW · UUP00834	United Utilities	49.7	28	<1%	91	69	60	369	100%
Shap (Brackenber) WwNPS UUP01741	United Utilities	52.4	29	<1%	63	142	118	1,907	88%
Dufton sewage works overflow Dufton WwTW · UUP00659	United Utilities	41.5	23	<1%	6	43	28	89	100%
Shap sewage works overflow Shap WwTW · UUP01742	United Utilities	49.8	28	<1%	50	44	36	604	100%
Murton (Bridge House) pumping station overflow Murton (Bridge House) PS · UUP01362	United Utilities	46.7	26	<1%	7	6	6	8	99%

A dash: no annual return for that overflow in that year.

Sources and credits

Storm overflow annual returns: © Environment Agency copyright and/or database right 2025, Open Government Licence v3.0. Overflow positions: the water companies via the National Storm Overflow Hub, CC BY 4.0. River network: contains OS data © Crown copyright and database right 2026 (OS Open Rivers). Traced and weighted by SwimSignal (swimsignal.co.uk), whose method is at swimsignal.co.uk/methods.html. All credits and licences.