Water Quality Report · Updated May 12, 2026
LAYTON CITY WATER SYSTEM
LAYTON CITY WATER SYSTEM delivers tap water graded C (67/100) by TapWaterSafety.org. The utility serves approximately 82,000 residents in LAYTON, Utah using surface water (purchased). The most significant water quality concerns are: Arsenic significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 801-336-3720.
Is LAYTON tap water safe to drink?
LAYTON CITY WATER SYSTEM delivers tap water that earns a grade of C (67/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 82,000 residents in LAYTON, drawing from surface water (purchased).
Public testing data identifies 13 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Haloacetic acids (HAA5), Bromodichloromethane, Trichloroacetic acid, Chloroform, Dibromochloromethane, Dichloroacetic acid, Chromium (hexavalent), Dibromoacetic acid*, Radium, combined (-226 and -228), Nitrate. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for LAYTON residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for LAYTON CITY WATER SYSTEM.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.7 ppb, 175x above the EWG health guideline of 0.004 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 24.9 ppb, 166x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 8.87 ppb, 148x above the EWG health guideline of 0.06 ppb.
Contact LAYTON CITY WATER SYSTEM
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for LAYTON
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 67/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
0.7 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 175× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
24.9 ppb | 0.15 | 80.0 | 100 | — | — | — | 166× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
8.87 ppb | 0.06 | — | — | — | — | — | 148× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
12.4 ppb | 0.1 | 60.0 | 60 | — | — | — | 124× over |
| Bromodichloromethane Disinfection byproduct |
6.16 ppb | 0.06 | — | — | — | — | — | 103× over |
| Trichloroacetic acid Disinfection byproduct |
7.68 ppb | 0.1 | — | — | — | — | — | 77× over |
| Chloroform Disinfection byproduct |
15.7 ppb | 0.4 | — | — | — | — | — | 39× over |
| Dibromochloromethane Disinfection byproduct |
2.33 ppb | 0.1 | — | — | — | — | — | 23× over |
| Dichloroacetic acid Disinfection byproduct |
4.57 ppb | 0.2 | — | — | — | — | — | 23× over |
| Chromium (hexavalent) Heavy metal |
0.391 ppb | 0.02 | — | — | — | — | — | 20× over |
| Dibromoacetic acid* Disinfection byproduct |
0.267 ppb | 0.03 | — | — | — | — | — | 8.9× over |
| Radium, combined (-226 and -228) Radiological |
0.19 pCi/L | 0.05 | 5.0 | — | — | — | — | 3.9× over |
| Nitrate Inorganic |
0.438 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.1× over |
| Antimony* Heavy metal |
0.7 ppb | 1.0 | 6.0 | 10 | 20 | 1 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.155 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
25.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
43.0 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| 6:2 Fluorotelomer sulfonate (6 2FTS) * Other |
0.059 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.24 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.868 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.27 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Selenium* Heavy metal |
0.35 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Monobromoacetic acid* Disinfection byproduct |
0.0417 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA)* PFAS |
0.273 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.207 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS)* PFAS |
0.059 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Cyanide Inorganic |
3.0 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Fluoride Inorganic |
0.154 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
1.29 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
LAYTON CITY WATER SYSTEM service area
This water system serves 1 community in Davis County, Utah. Click any city for its dedicated tap water quality page.
Find the right filter for LAYTON water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.