Skip to content
TapBuff
ZIP

Willow Crossing MHP

What EPA’s and Colorado’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.

Serves
159 people
Connections
61
Water source
Surface water bought from another system
Based in
Fort Lupton (Lupton), CO
County
Weld
Owner
Private
Hardness
Soft

The short answer

Nothing in EPA’s and Colorado’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, not everything. No health-based violations on file since 2016.

What was found

Total trihalomethanes (TTHM), haloacetic acids (HAA5) and fluoride: Colorado’s own results, samples taken from Dec. 15, 2025 to Aug. 5, 2026.

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

56.3ppb

Highest yearly average, 2025 to 2026

2026, one sample: 45.9 ppb

Averaged by year, the highest was 56.3 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 73 ppb. In 2026, the latest year on file, its one sample was 45.9 ppb.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

36ppb

Highest yearly average, 2025 to 2026

2026, one sample: 33.5 ppb

Averaged by year, the highest was 36 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 43 ppb. In 2026, the latest year on file, its one sample was 33.5 ppb.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.13ppm

Highest yearly average, 2025

Averaged by year, the highest was 0.13 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

Hardness

Soft, typically 29 mg/L (1.7 grains per gallon), across 2 sampling points, in 2025.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 1.7 grains per gallon, salt includedSoftener or salt-free conditioner?Colorado water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5) and fluoride results here are Colorado’s own from 2025 on, with EPA’s national file for 2012 to 2019. Willow Crossing MHP’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Colorado’s results run from Dec. 15, 2025 to Aug. 5, 2026.

Testing your own tap

Willow Crossing MHP’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Colorado certifies.

No lab Colorado certifies is within 75 miles of the area Willow Crossing MHP serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 54 certified labs for Colorado

Sources

PWSID CO0162835. Rebuilt from EPA data on Oct. 18, 2026.

Also in Weld County

All Colorado utilities

What to do next