Is Mendon, UT Tap Water Safe to Drink?
Graded A, with 9 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
90/100
waterverge.com Mendon, UT — Water Quality Report
Mendon's drinking water received a grade of A (90 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,640 residents using groundwater.
Lead levels were measured at 2.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 76 violations on record, including 1 health-based violation. 9 remain unresolved.
What to know about Mendon's water
Mendon ranks #18 out of 177 cities in Utah for water quality, placing it one of the best in the state.
Mendon relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Mendon may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mendon, UT water safe to drink?
Mendon's drinking water has significant quality concerns based on EPA testing data. With a grade of A (90/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,640 residents using groundwater (wells).
Recent water quality updates for Mendon
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mendon's water quality assessment. Grade: A (90/100).
Federal disaster declaration (FEMA DR-4311). Flood event — may have impacted local water infrastructure.
Contaminants: Revised Total Coliform Rule.
Contaminants: Surface Water Treatment Rule.
Contaminants: Surface Water Treatment Rule.
Federal disaster declaration (FEMA DR-4011). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Mendon's water supply.
Well within EPA limits.
Violation history
Mendon's water system has 76 total violations on record, including 1 health-based violation. 9 remain unresolved.
Flood & environmental risk
Cache County has experienced 4 federally declared disasters since 1986. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Bear River, Summit Creek, Little Bear River, Salt Creek.
Where does Mendon's water come from?
Mendon's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,640 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Bear River (river), Summit Creek (river), Little Bear River (river), Salt Creek (river).
What Mendon residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Mendon's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Mendon's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Mendon
Industrial polluters nearby
Reported releases to surface water by facilities near Mendon, ranked by pounds discharged annually.
Total reported releases to surface water: 0 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
TTM TECHNOLOGIES INC. LOGAN, UT84321 | Copper And Copper Compounds | 0 | 7.0 mi |
SWIFT BEEF CO HYRUM, UT84319 | — | — | 7.6 mi |
HYRUM HOT PLANT HYRUM, UT84319 | — | — | 8.9 mi |
WEST POINT DAIRY PRODUCTS INC HYRUM, UT84319 | — | — | 7.5 mi |
BAICOR LOGAN, UT84321 | — | — | 7.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtCache County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Cache County has experienced 4 federally declared disasters since 1986. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 2.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mendon compares by contaminant
Explore where Mendon ranks among all Utah cities for specific contaminants.
Water source & infrastructure
Where Mendon's water comes from
Mendon's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 1,640 people through 1 water system.
Water bodies near Mendon
Mendon is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mendon
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MENDON CITY | UTAH03011 | 1,640 | GW |
How Mendon compares
Full Utah rankings →Mendon's score of 90/100 is above the average of 50/100 among major Utah cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Utah rankings →About Mendon, UT
Wikipedia →Mendon is a city in Cache County, Utah, United States. The population was 1,339 at the 2020 census. It is included in the Logan, Utah-Idaho Metropolitan Statistical Area.
Learn more about your water
Guides and resources related to Mendon's water quality findings.
Explore water quality across Cache
Frequently asked questions
Is Mendon, UT tap water safe to drink?
Mendon's water quality earned a grade of A (90/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #18 out of 177 cities tested in Utah.
What contaminants are in Mendon's water?
Lead was measured at 2.0 ppb (90th percentile). 76 violations are on record.
How is Mendon's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Mendon?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mendon's water come from?
Mendon's water is sourced from Groundwater. The city has 1 water system serving approximately 1,640 residents.
What health violations has Mendon's water system had?
Mendon has 1 health-based violation on record. The most recent violation was recorded in April 2017. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 9 violations remain unresolved.
Is Mendon's groundwater at risk of contamination?
Mendon uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 76 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Mendon's water compare to other cities?
Mendon ranks #18 out of 177 cities in Utah (better than 90% of state cities) and #2476 out of 15744 cities nationally (84th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mendon's small water system affect quality?
Mendon's system serves approximately 1,640 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 76 violations on record.