Is Mount Holly, AR Tap Water Safe to Drink?
Graded A+ with no contaminants above EPA limits. Here's everything we tested and how Mount Holly ranks. What to do next ↓
95.2/100
waterverge.com Mount Holly, AR — Water Quality Report
Mount Holly's drinking water received a grade of A+ (95.2 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 867 residents using groundwater.
Lead levels were measured at 1.0 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 9 violations on record, including 4 health-based violations. All violations have been resolved.
What to know about Mount Holly's water
Mount Holly ranks #22 out of 345 cities in Arkansas for water quality, placing it one of the best in the state.
Mount Holly 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, Mount Holly may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mount Holly, AR water safe to drink?
Based on EPA testing data, Mount Holly's tap water is generally safe to drink. The water system earned a grade of A+ (95.2/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 867 residents using groundwater (wells).
Recent water quality updates for Mount Holly
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mount Holly's water quality assessment. Grade: A+ (95.2/100).
Federal disaster declaration (FEMA DR-3541). Hurricane event — may have impacted local water infrastructure.
1 health-based. Contaminants: Coliform (TCR).
1 health-based. Contaminants: Coliform (TCR).
Federal disaster declaration (FEMA DR-3215). Hurricane event — may have impacted local water infrastructure.
Contaminants: Chlorine.
Key contaminant findings
Based on the most recent EPA sampling data for Mount Holly's water supply.
Well within EPA limits.
Violation history
Mount Holly's water system has 9 total violations on record, including 4 health-based violations. All violations have been resolved.
Flood & environmental risk
Union County has experienced 8 federally declared disasters since 1969. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Mount Holly's water come from?
Mount Holly's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 867 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Mount Holly residents can do
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.
Mount Holly'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 Mount Holly
Industrial polluters nearby
Reported releases to surface water by facilities near Mount Holly, ranked by pounds discharged annually.
Total reported releases to surface water: 0 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
LANXESS - WEST PLANT MAGNOLIA, AR71753 | Lead And Lead Compounds | 0 | 8.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtUnion County is currently in D3 (extreme 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
Union County has experienced 8 federally declared disasters since 1969. 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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mount Holly compares by contaminant
Explore where Mount Holly ranks among all Arkansas cities for specific contaminants.
Water source & infrastructure
Where Mount Holly's water comes from
Mount Holly'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 867 people through 1 water system.
Water systems serving Mount Holly
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MARYSVILLE WATER ASSOCIATION | AR0000001 | 867 | GW |
How Mount Holly compares
Full Arkansas rankings →Mount Holly's score of 95.2/100 is above the average of 75/100 among major Arkansas cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Arkansas rankings →Learn more about your water
Guides and resources related to Mount Holly's water quality findings.
Explore water quality across Union
Frequently asked questions
Is Mount Holly, AR tap water safe to drink?
Mount Holly's water quality earned a grade of A+ (95.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #22 out of 345 cities tested in Arkansas.
What contaminants are in Mount Holly's water?
Lead was measured at 1.0 ppb (90th percentile). 9 violations are on record.
How is Mount Holly'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 Mount Holly?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mount Holly's water come from?
Mount Holly's water is sourced from Groundwater. The city has 1 water system serving approximately 867 residents.
What health violations has Mount Holly's water system had?
Mount Holly has 4 health-based violations on record. The most recent violation was recorded in April 2015. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. All health violations have been resolved.
Is Mount Holly's groundwater at risk of contamination?
Mount Holly 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 9 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 Mount Holly's water compare to other cities?
Mount Holly ranks #22 out of 345 cities in Arkansas (better than 94% of state cities) and #342 out of 15744 cities nationally (98th percentile). The grade of A+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mount Holly's small water system affect quality?
Mount Holly's system serves approximately 867 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 9 violations on record.