Ynys Môn - Live Sewage

Polluted by sewage 5,581 hours in 2026 so far..

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Ynys Môn so far for 2026. It is an estimate, based on very poor quality live data from the Water Companies. The water companies report their sewage to the Environment Agency every year in April. You can see the last reported year in the other page

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Constituencies near Ynys Môn

Daily Data

We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Ynys Môn, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.

Each CSO has a row, the most recent data is on the right hand side.

Monitoring Online

Monitoring Offline

Polluting

Potentially Polluting

Unknown

Daily data is experimental and data is not guaranteed to be accurate. Please inform us of any issue, we will fix.

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Totals so far

Company	CSO ID	Overflow Days	Total Duration (hours)	Total Duration (days)
Dwr Cymru Welsh Water	35dc8149e84b0c70b2751aaad4e060208c346a6725b3492a0629779f81377a37	47	1,001 h 4m	41.71
Dwr Cymru Welsh Water	7bf669941fac44461c3407f08380b031265124d87a250ce4e9377dddf5ade60c	43	982 h 50m	40.92
Dwr Cymru Welsh Water	ba4b9b3b9a4a997a7de679571585ae284c806ddcb5cab2f99959c492567a5d14	48	548 h 27m	22.83
Dwr Cymru Welsh Water	447b366bf0314e998e0776bd14cae318b3b3f9252eb56d4c75b108397c5804d1	21	440 h 15m	18.33
Dwr Cymru Welsh Water	b400bce374bfb9092e4b770ee1d427ee1f55f7a5fad28e0d29593909e0004ef4	20	332 h	13.83
Dwr Cymru Welsh Water	3e1a0e6fdb1e1784268b920024262ba8f805380816141ebd17694827c851bb65	36	328 h 3m	13.67
Dwr Cymru Welsh Water	c8767208c472fbd87343dccbe0cd184af5e9345fbc43a11f42e0bb94620c5f38	21	228 h 15m	9.5
Dwr Cymru Welsh Water	c4bf0656cdf16f97f4f2913fe6ba9d7991557a25bedce5e2de7b198a357f2a36	12	210 h 17m	8.75
Dwr Cymru Welsh Water	fc248037ec1a3db0b9b04cbda4f7aae4a7d632c183af0fc98dcf751631950d6e	11	199 h 9m	8.29
Dwr Cymru Welsh Water	326177c00cd352d5bc2cb9ff745b2da09a251fc41b1d6af862914e297b0294ea	14	173 h 15m	7.21
Dwr Cymru Welsh Water	9443e6fe53c9a3aa1af55fdc638f0702fb1dfb15f897348d2e9e3d5d85da14db	7	112 h 45m	4.67
Dwr Cymru Welsh Water	b195a3ff5bf96d439cd55a6a67601ed491df8be9a6a9fd472c5d597ef657f519	11	108 h 15m	4.5
Dwr Cymru Welsh Water	a1920de74b21928bd75ce875b3f4bb480066512c6b9d8ff28fea0033b4410691	9	99 h 20m	4.12
Dwr Cymru Welsh Water	6fd70373951a19587dbf7504c33d75baf78348fea8eeacb1e4089e33881f66fb	13	88 h 53m	3.67
Dwr Cymru Welsh Water	86fce6c9bed0dfcabb7d1fc5b0a9ebca34b2036caab94c7cd26c36a3e6e10e66	16	76 h	3.17
Dwr Cymru Welsh Water	9eab4b1eee3438a4d7c7922264c8a3fdaf9b2c23e74fcdd097c3fb0f7f8a0baa	10	73 h 45m	3.04
Dwr Cymru Welsh Water	71cb35c7ea21b3f429afc3bb7878f616816c7f3659a6054478db548e7042b97a	8	73 h 15m	3.04
Dwr Cymru Welsh Water	6c8fc664d02d95bd197f6b81bf6620870ec92bb2f70c68c7d2bc3449000593b1	8	67 h 30m	2.79
Dwr Cymru Welsh Water	e9e893c56963a7a9f3ab53bfb2206a9f6f7e0663325697b7caa8027287b28723	17	62 h 15m	2.58
Dwr Cymru Welsh Water	39990556e687bb85bbdd30cfc71554f767a934fc274ff7a3f318f1bf37e808cc	4	57 h 30m	2.38
Dwr Cymru Welsh Water	adb4a4803c06ee85608a84787d70d87c520c0d80d975005ea6c39da6961f7ef4	17	56 h	2.33
Dwr Cymru Welsh Water	2a5852d4ad669e3efdbbca04f9d05356ebf3ac562ea6bd603e4afd2ddc867283	6	54 h 28m	2.25
Dwr Cymru Welsh Water	cae4b23f34adbe05061efdcc9dde9836797b16d0669a508bbfb0a1ed79cbeb1e	5	24 h 24m	1
Dwr Cymru Welsh Water	fc8157f5bce7aa0887f7f6964cf0a7e78c6c1139e762b23510957bdf64d07840	8	23 h 21m	0.96
Dwr Cymru Welsh Water	9f5e4d8c97bc504ab51f5394d21496873de31c9d54171a4e1041485ca8917ebf	4	23 h 4m	0.96
Dwr Cymru Welsh Water	b358c3800eb7fbdb0a4f9962c6f874987f92d4a10262b7982f7d9064188b0ef7	6	15 h 45m	0.62
Dwr Cymru Welsh Water	78197110da8c47b97b4244fd251c060811e0e3c30de87d36d3d3a186669f4782	3	13 h 43m	0.54
Dwr Cymru Welsh Water	99cc17bff57e7a412d9143077d96eaae455e7bd6a8a2e388cbfbb4825db5c225	1	12 h 15m	0.5
Dwr Cymru Welsh Water	6e47c1b76ddef7b1e1f5061d83d93706351a245ee16334238180be66ea584776	6	11 h	0.46
Dwr Cymru Welsh Water	dd1348223be64b0222f4a62e0cb382bd1bf728625c9e6dc93a5e00dbbcc1a268	9	10 h 6m	0.42
Dwr Cymru Welsh Water	b35da0d2e88b73c3005575cc2d15066acd20a8745b88e0665c301462036f0112	5	9 h 30m	0.38
Dwr Cymru Welsh Water	5f240e0b5f841ebb54277c0cf2c70c59922adc90dd8d55618525cd92c1d36fc3	5	9 h 30m	0.38
Dwr Cymru Welsh Water	d70826ec2fefc7bf25a2953607c5d649d0571d0e2f491ac1cf7b991a558904e3	3	8 h 27m	0.33
Dwr Cymru Welsh Water	d20b056f2b8df15b58b524b7cbe8709b700319673429293248c43b756f6ac2ce	5	7 h	0.29
Dwr Cymru Welsh Water	4cf64f03c053f6a2ef789960a8127c431bd90a507782d2d5c93877ca93ec5007	4	5 h 38m	0.21
Dwr Cymru Welsh Water	0b67c70f266b2c29aa34552903ff0b51100007587a8491b9502d0ab4764c23a8	1	5 h 15m	0.21
Dwr Cymru Welsh Water	0dd591ca3fec46c28827dbea4d970c55a605c4a398a37f185c7fc95c1ef3c98f	1	3 h 45m	0.12
Dwr Cymru Welsh Water	e8ef3ab9b25df60b04b0e6e8b7085ac305956463127955d8524616a9b9a09118	1	3 h 45m	0.12
Dwr Cymru Welsh Water	96d501c53f3fe473700f55bc6a263b884b28f4d58a87cb606805f3a26f888807	1	2 h 45m	0.08
Dwr Cymru Welsh Water	86f65a1cf1c77e87b6b4428eac7a0f69d720f1c3165c9d6ceacf41b312bda2c0	3	2 h 30m	0.08
Dwr Cymru Welsh Water	e8f35d7394a73db356a47ac58d15f1a219fe1c568c3158dbc45cd43ec7b0b737	3	2 h 30m	0.08
Dwr Cymru Welsh Water	07ed1ca6a3ebc59ce5ea63dafc0e015e29d505aa84d4def104f7566f2506af5b	1	2 h 30m	0.08
Dwr Cymru Welsh Water	a6990c2b677e0fa55da2327961af1de48b35f4edf804740939d7a72756c1bc4a	4	2 h 15m	0.08
Dwr Cymru Welsh Water	15ee3ee12f7763ea1b0e2ffe51038cdeb2b3d95ecdc51754bd9403f397ab2173	1	1 h 45m	0.04
Dwr Cymru Welsh Water	46cccbd3fd3996f608e6220687ca0f0d5c939f15ab53ac62b5981ac12fd8ea77	1	1 h 30m	0.04
Dwr Cymru Welsh Water	44d63983497c5635a032f4fd40ef22c7e32bd0722f853a843292c231b2624844	2	1 h 14m	0.04
Dwr Cymru Welsh Water	84ec884902b26937464473e26b04a4c5d2f2e06d5f3f30e65d9fff0fa175fa82	1	1 h 2m	0.04
Dwr Cymru Welsh Water	118e974b2fe0c66b28cfa598c96a053eab9ac8e63b86046968220cb1db293433	2	0 h 59m	0
Dwr Cymru Welsh Water	5a4e80b79c16118a92a7b5f4ba50cefc77b2fecf845c64935d978e739907892a	1	0 h 33m	0
Dwr Cymru Welsh Water	62c4762b6bd9c54f9ac7797651959cb6f38356d28a49986e367541267fe8b6d0	1	0 h 30m	0
Dwr Cymru Welsh Water	19ab1ceff91672d49c7a4ee831c907c65e448faf7fab7152701f74cd22441c68	2	0 h 27m	0
Dwr Cymru Welsh Water	d8d33ddf50d8d1a17306f6214f4802b2d886b397479a519a8c4452f3f05b4812	7	0 h 22m	0
Dwr Cymru Welsh Water	8b5d5775624216b99c90abb693b2f517e5610f3f36ca2321c873e7ca94ed190d	1	0 h 15m	0
Dwr Cymru Welsh Water	e78d0ad2f5a24717127fa05abe6999c2ac678d6c136bba2072e3508502971c41	1	0 h 1m	0
Dwr Cymru Welsh Water	24ecf64fe584c8c6e37ce1996c693a6d2dc5e61bdc514fed0471ae1e12f4a3fd	0	0 h	0
Dwr Cymru Welsh Water	118acd7ecffe93c705ff3a44041409a9b7588d6682f5497e7a4663e7c2d821b7	0	0 h	0
Dwr Cymru Welsh Water	1ac3f9d0e0b4b26b052235a1ab8ff0bed6b056d5410a3272a1ea61bc93f08cea	0	0 h	0
Dwr Cymru Welsh Water	3196542c48787ad42c56b1b27652919211bb962ec31656362d91255ce96c1adb	0	0 h	0
Dwr Cymru Welsh Water	a696a559f35252f701db27ea191b403af297a9eb4cf30cce25736cd96fe592d5	0	0 h	0
Dwr Cymru Welsh Water	bcd8562d254ac2be3bbde98548b8e27368e7cc0188506cc9fd6eff18c2db88ec	0	0 h	0
Dwr Cymru Welsh Water	0577c3f99e0dc42ee4aacf6f48d3f28a88986a9d1301bba30dc4fb556aa473f9	0	0 h	0
Dwr Cymru Welsh Water	1a93d8a885b3fb81a8094e0669da805c3c5852bdf68acd2dc637c7c254d8c881	0	0 h	0
Dwr Cymru Welsh Water	bf2ffc01d3921bdabf8f17752eb0380da77ce80e19845f456ab741e602f13f85	0	0 h	0
Dwr Cymru Welsh Water	d269b3601d2a7c715022d6c2689f92086e412111e4cf685a4c9b95a1e8077d5c	0	0 h	0
Dwr Cymru Welsh Water	fe5761e0b9afaf838523fc6617a76139846881d6b06be0090c8191f09706876d	0	0 h	0
Dwr Cymru Welsh Water	9604b3ffe73dddacad70a3f442c817df46975018d942affc3e5a9830badb133b	0	0 h	0
Dwr Cymru Welsh Water	78ec7d3d5c1e588e129c7e71a6a7f1c8730e475a54413d201d1d77f782621f08	0	0 h	0
Dwr Cymru Welsh Water	7895187aa3a8545c4510619362bcad905618fb615d2d900bea16b822a441d6b6	0	0 h	0
Dwr Cymru Welsh Water	e327b24e3ae3f80c79c59d61750aa82ff3ee8f10557830c2e6343c3397d51f91	0	0 h	0
Dwr Cymru Welsh Water	fd4d1399fb3117c82c44bbf28120b24c19866db86000322c648b05d455884835	0	0 h	0
Dwr Cymru Welsh Water	76e25d20eec2e83b8649f56f018da104f16ca218182dc76840565e919901e722	0	0 h	0
Dwr Cymru Welsh Water	84175de81ce8723c3d209d6243015aa3a4ca217b30f9a9a18234d90f2b92a914	0	0 h	0
Dwr Cymru Welsh Water	fe32ceb7e50bee254e16c7906e5bea2a801f95ad1e55c5d18e1e846e0132f711	0	0 h	0
Dwr Cymru Welsh Water	86c8e2b1607d11b3f35583e16ac46b5ba27aa426bb597c40fcc609965a813696	0	0 h	0
Dwr Cymru Welsh Water	d3cf513465f6739fbbe9769dcd85ffcd061ef66358cabb0361475d1cb6fe5e34	0	0 h	0
Dwr Cymru Welsh Water	5a2ffed161fb7871ddab1d6442b805ba074a2ccc7614b3fd5cf8ef7de677a400	0	0 h	0
Dwr Cymru Welsh Water	8258c56ad44af18eb30bfc2a9af1448731955ac7f3b5543b29fc59ae616e3d19	0	0 h	0
Dwr Cymru Welsh Water	5464d72fe0de9459fb82ae6f806d983906b2847c3e6fbeb8e8641032065c722c	0	0 h	0
Dwr Cymru Welsh Water	198122883e84439349ba6fc23779c956c413f4eb179e485617a4497073537e22	0	0 h	0
Dwr Cymru Welsh Water	518bf2d7908a1288e3434e7c32f3ce81061879bb274618ce4313eed2d272b8a6	0	0 h	0
Dwr Cymru Welsh Water	a2ecde78b7952298344e76e5ede3accb8aacaebe26484e624cdffd70ecfb2c61	0	0 h	0
Dwr Cymru Welsh Water	68c2f26423501ff4d4535fce7cfbc43ff63fe9596e0e4aebbdad76b6b4e30c61	0	0 h	0
Dwr Cymru Welsh Water	083d30de37439bce5419d5881d49623276c91710d7c27c88605df95bbca2bc25	0	0 h	0
Dwr Cymru Welsh Water	87894ed15c533ddcba11fdd29fb8589986c172764ad5d89a99fa6d25423f1e63	0	0 h	0
Dwr Cymru Welsh Water	0ee02cec4eb8bc0303e60a2e7a3854ad820e70186f21543ecf206c076cdb4ca1	0	0 h	0
Dwr Cymru Welsh Water	581daf504f2371602fceed9a55977187aa5369d40dbfe8ac9f448b991401c83a	0	0 h	0
Dwr Cymru Welsh Water	fe1520d6fa852433ec262c4df94d1986017523985f6a1688fab0ed41b9f81c46	0	0 h	0
Dwr Cymru Welsh Water	e6e949ff48d8fb511e64bcb904586867eee261049dc79b9834cc045de5da4fd6	0	0 h	0
Dwr Cymru Welsh Water	9612eb2d9d1111a8711ac684aef098f20cb4ad4489ffd287cfb6377c3e3039e7	0	0 h	0
Dwr Cymru Welsh Water	6da5a26672e32a054161e51e8a5f7fb7561032b4893539b1a03a9a5498c95ff7	0	0 h	0
Dwr Cymru Welsh Water	e044e8edb7bcbb858a8ff6d4816031432166f0255fc7a24df5f879e19e7a771f	0	0 h	0
Dwr Cymru Welsh Water	ea49b432ec0875c594dfde711191058a41322616fa150a7016e449225ee5701d	0	0 h	0
Dwr Cymru Welsh Water	1ecc275e890aef73781d94a43b2251a893fc349eaf8988691fa5c8db1995cfcd	0	0 h	0
Dwr Cymru Welsh Water	14a5b34aba4d462b15a28e3a6a807bd23c4093d983b9673735e59ddacdef6c91	0	0 h	0
Dwr Cymru Welsh Water	95a1fc05c5d4b3b72bb0f945cb709671804a6e76873293454fb6b96ba5a2ce68	0	0 h	0

Data Sources & Accuracy

EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water

Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API

Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.

This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.

This project is not associated, approved or endorsed by any of the companies whose logos you see here.

Analysing sewage pollution by the Water Industry

Media Queries

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Ynys Môn - Live Sewage Polluted by sewage 5,581 hours in 2026 so far..

Ynys Môn - Live Sewage