Tap Water Quality Report
Tap water quality in LAS CRUCES, New Mexico
Tap water in LAS CRUCES, New Mexico receives a grade of F (58/100) from TapWaterSafety.org. It's served by LAS CRUCES MUNICIPAL WATER SYSTEM. The most significant water quality concerns are: Arsenic significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromodichloromethane significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in LAS CRUCES's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving LAS CRUCES.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 3.1 ppb, 775x above the EWG health guideline of 0.004 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 34.3 ppb, 229x above the EWG health guideline of 0.15 ppb.
Bromodichloromethane significantly above health guideline
Moderate concernBromodichloromethane detected at 8.65 ppb, 144x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for LAS CRUCES MUNICIPAL WATER SYSTEM (system ID NM3511707) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Ground Water Rule | Missed testing or reporting | 11/08/2025 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for LAS CRUCES
Filters matched to the specific contaminants in LAS CRUCES's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts like TTHM. Look for NSF/ANSI 53 VOC or chloroform reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in LAS CRUCES's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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 |
3.1 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 775× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
34.3 ppb | 0.15 | 80.0 | 100 | — | — | — | 229× over |
| Bromodichloromethane Disinfection byproduct |
8.65 ppb | 0.06 | — | — | — | — | — | 144× over |
| Dibromochloromethane Disinfection byproduct |
13.1 ppb | 0.1 | — | — | — | — | — | 131× over |
| Dibromoacetic acid Disinfection byproduct |
3.86 ppb | 0.03 | — | — | — | — | — | 129× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
7.54 ppb | 0.06 | — | — | — | — | — | 126× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
9.42 ppb | 0.1 | 60.0 | 60 | — | — | — | 94× over |
| Chromium (hexavalent) Heavy metal |
1.12 ppb | 0.02 | — | — | — | — | — | 56× over |
| Dichloroacetic acid Disinfection byproduct |
3.77 ppb | 0.2 | — | — | — | — | — | 19× over |
| Bromoform Disinfection byproduct |
8.03 ppb | 0.5 | — | — | — | — | — | 16× over |
| Radium, combined (-226 and -228) Radiological |
0.62 pCi/L | 0.05 | 5.0 | — | — | — | — | 12× over |
| Chloroform Disinfection byproduct |
4.44 ppb | 0.4 | — | — | — | — | — | 11× over |
| Uranium Radiological |
4.12 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 9.6× over |
| Trichloroacetic acid Disinfection byproduct |
0.754 ppb | 0.1 | — | — | — | — | — | 7.5× over |
| Nitrate and nitrite Inorganic |
0.505 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 3.6× over |
| Manganese Heavy metal |
107.5 ppb | 100.0 | — | 50 | 80 | — | — | Fails EU |
| Trichloroethylene Volatile organic compound |
0.127 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0887 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| 1,2-Dichloropropane Volatile organic compound |
0.116 ppb | 0.5 | 5.0 | — | — | — | — | Below guideline |
| Molybdenum Other |
7.07 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
2.73 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
55.6 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Chlorate Disinfection byproduct |
4.55 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.525 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.492 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.2 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Di(2-ethylhexyl) adipate Other |
0.328 ppb | 200.0 | 400.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
1.04 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.143 ppb | — | 100.0 | — | — | — | — | Below guideline |
| cis-1,2-Dichloroethylene Volatile organic compound |
0.0611 ppb | — | 70.0 | — | — | — | — | Below guideline |
| Cyanide Inorganic |
0.4 ppb | — | 200.0 | 50 | 70 | 150 | — | Below guideline |
| Fluoride Inorganic |
0.545 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.164 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
72.2 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from LAS CRUCES MUNICIPAL WATER SYSTEM.