Tap water in LA4, LancasterSafe to drink.Soft.
Supplied by United Utilities. 1,851 samples, 16 substances, latest on 31 December 2024. Everything is inside the legal limit, and nothing comes close to it.
9.4 / 10
The tank is as full as the score. The specks are the minerals that make water hard.
What to do about it
ZeroWater 12-Cup Ready-Pour
£40typical price
Households concerned about PFAS and heavy metals
Waterdrop 10UA Under Sink
£70typical price
High-volume under-sink filtration without RO complexity
BRITA Marella XL + MAXTRA PRO
£25typical price
Basic chlorine and taste improvement on a budget
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What's in a glass of LA4 water
Every bubble is a substance the lab measured. The higher it floats, the closer it came to its legal limit, the dashed line at the top.
Trihalomethanes came closest to a limit, at 34% of it. 15 of 16 substances used under a quarter of theirs.
- Trihalomethanes34%
- Bromate7%
- Ammonia6%
- Antimony6%
- Turbidity6%
- Lead6%
- Aluminium4%
- Nitrate4%
- Nickel4%
- Iron3%
- Selenium2%
- Cadmium2%
- Chromium2%
- Nitrite2%
- Manganese<1%
- Copper<1%
All 16 results as a table
| Substance | Result | Legal limit | Share of limit |
|---|---|---|---|
| Aluminium | 0.00871 mg/L | 0.2 mg/L | 4% |
| Iron | 0.007 mg/L | 0.2 mg/L | 3% |
| Turbidity | 0.24 NTU | 4 NTU | 6% |
| Manganese | 0.00045 mg/L | 0.05 mg/L | <1% |
| Bromate | 0.0007 mg/L | 0.01 mg/L | 7% |
| Trihalomethanes | 0.0337 mg/L | 0.1 mg/L | 34% |
| Nitrate | 2.04 mg/L | 50 mg/L | 4% |
| Nitrite | 0.0075 mg/L | 0.5 mg/L | 2% |
| Ammonia | 0.0321 mg/L | 0.5 mg/L | 6% |
| Cadmium | 0.00009 mg/L | 0.005 mg/L | 2% |
| Chromium | 0.00083 mg/L | 0.05 mg/L | 2% |
| Antimony | 0.00031 mg/L | 0.005 mg/L | 6% |
| Selenium | 0.00085 mg/L | 0.04 mg/L | 2% |
| Copper | 0.0000104 mg/L | 2 mg/L | <1% |
| Nickel | 0.00077 mg/L | 0.02 mg/L | 4% |
| Lead | 0.00055 mg/L | 0.01 mg/L | 6% |
51mg of limescale minerals in every litre
Soft water. Kind to kettles, boilers and skin
You will not need a softener here, and you will use less soap and detergent than most of England.
Your river is the Overton Dyke, rated moderate
The Environment Agency rated the Overton Dyke as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants.
None of this is a test of your tap water. Environment Agency record · River health across England
LA4 in short
Tap water in LA4 (Lancaster) is supplied by United Utilities in the Lancaster Central zone and scores 9.4 out of 10, against an England and Wales average of 9.0. None of the 16 tested substances came close to a limit. The latest sample is from 31 December 2024.
- 4th cleanest of 6 areas tested in LancasterSquarely mid-table for Lancaster, between LA1 on 9.6 and LA6 on 9.4.
- Soft water at 51 mg/LLimescale is not a problem in LA4, so skip softeners and scale filters entirely. How hardness is measured
- Nothing tested came within 40% of its legal limitThe highest was Trihalomethanes at 34% of the 0.1 mg/L maximum. See every reading
Questions about LA4 water
Is LA4 tap water safe to drink?
Based on the latest tests, LA4 (Lancaster) water scores 9.4/10, which is safe. 0 of 16 tested contaminants exceeded recommended levels. Water is supplied by United Utilities.
What contaminants are in LA4 water?
We tested 16 contaminants in LA4 water. None exceeded recommended safe levels.
Who supplies water in LA4?
LA4 (Lancaster) is supplied by United Utilities. You can view their full profile and compliance data on our supplier page.
Is LA4 water hard or soft?
Water in LA4 (Lancaster) has a hardness of 51 mg/L CaCO3, which is classified as soft. Soft water is gentle on appliances and skin.
Should I use a water filter in LA4?
LA4 water scored 9.4/10 with no contaminants above recommended levels. A filter is optional but can improve taste, especially if you notice a chlorine flavour. See our filter recommendations for your area.
Are there PFAS forever chemicals in LA4 water?
No PFAS (forever chemicals) result is attached to the tap-water tests for LA4, and the Environment Agency has no PFAS detections in rivers or groundwater within 10 km of it. That reflects where sampling has happened as much as the water itself.
How clean is the river near LA4?
The Environment Agency rated the Overton Dyke as moderate for ecological health in its 2025 assessment, meaning the river is noticeably changed by pollution or engineering. It is held back by dissolved oxygen and phosphate. It fails the chemical test, as every river, estuary and stretch of coast in England does, because of long-lasting pollutants such as mercury, PFOS (a forever chemical) and old flame retardants. This is a rating of the river, not of tap water in LA4, which is treated before it reaches homes.
Keep reading
- Is UK Tap Water Safe?Everything you need to know about tap water safety in the UK
- Best Water Filters UKEvery filter type compared on what it actually removes
- How to Test Your Tap WaterFrom DIY strips to professional lab analysis
- Best Water Filter Jug UKBRITA vs ZeroWater vs the rest, tested against real data
How to test your waterBest water filtersFilter shower headsWater testing kitsUK water rankingsWater hardness checkerWater hardness map
River and groundwater readings near LA4
Environment Agency samples from rivers, groundwater and reservoirs nearby. Not your tap water. For scale they are shown against drinking water limits; rivers are judged against much stricter environmental standards, and on those every river in England fails for chemicals.
Get alerts for your area
We'll email you when water quality data changes for LA4.