Welsh Water will compensate 37,000 north Wales customers advised to boil drinking water to avoid a stomach bug.
The company said the £25 payments, to be made in the new year, would make up for energy costs and the inconvenience.
The outbreak of cryptosporidium has been linked to the Cwellyn water treatment works in Snowdonia.
But Welsh Water said the payout did not mean the water supply was to blame, as investigators are yet to find the source of the illness.
Health officials said 193 people had been infected with the water-borne parasite since 1 October. They said further cases were likely to be detected.
The warning to boil water was issued to 37,000 households - around 70,000 people - on 29 November. The notice will be in force until at least 9 January.
On Friday, the "all clear" notice was issued to 9,000 households after their water was switched from the Cwellyn treatment works.
But Welsh Water said payments would be made to all customers who had been advised to boil water during the cryptosporidium outbreak.
The company is writing to the affected households with details of the compensation.
Beth Angell, from Caernarfon, has been boiling water in her home since the order was first made.
She said she was pleased some compensation had been offered, but said £25 was not enough.
Residents wishing to find out whether their home's supply is affected can check their postcode against a list held by Dwr Cymru Welsh Water at any time by ringing 0800 052 0130.
NHS Direct is operating two help lines on 0845 850 9850 and 0845 600 6086 between 0900 GMT and 1800 GMT on weekdays, and 0900 GMT and 1700 GMT at weekends.
"It's better than a smack in the mouth I suppose, but I can guarantee I've spent more than that on bottled water and the increase in the electricity bill that we're probably going to get," she said.
"But it's fair play to them (Welsh Water), offering something. You hear a lot of cases where you don't get anything back.
"They're to be commended but it isn't going to go very far with a lot of people with the extra expense."
Welsh Water said cheques would be sent to customers in the following areas:
Areas B - D
Bangor, Beaumaris, Beddgelert, Bethania, Bethel, Bethesda, Betws Garmon, Bodorgan, Bontnewydd, Brynrefail, Brynsiencyn, Caeathro, Caernarfon, Carmel, Ceint, Cerrigceinwen, Clwt Y Bont, Cwm Y Glo, Cwm-y-glo, Deiniolen, Dinas, Dinorwic, Dwyran.
Areas F - L
Fachwen, Ffridd Uchaf, Gaerwen, Gallt Y Foel, Gerlan, Glasinfryn, Groeslon, Hermon, Landegai Ind Est, Llanberis, Llandaniel, Llandegai, Llandegfan, Llandwrog, Llandygai, Llanfaes, Llanfaglan, Llanfairpwllgwyngyll, Llangadwaladr, Llangaffo, Llangenfi, Llangoed, Llangristiolus, Llanllechid, Llanrug, Llanwnda.
Areas M - Y
Malltraeth, Menai Bridge, Mynydd Llandygai, Nantmor, Niwbwrch, Penisarwaen, Penmynydd, Pentre Berw, Penyffridd, Plas Gwynant, Pont Aberglaslyn, Pont-Rug, Rachub, Rhosgadfan, Rhostryfan, Rhy-Ddu, Seion, Tal Y Bont, Tanysgafell, Trefdraeth, Tregarth, Vaynol Hall, Waunfawr, Y Felinheli.