Is Mchenry, MS Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
90.8/100
waterverge.com Mchenry, MS — Water Quality Report
Mchenry's drinking water received a grade of A (90.8 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,653 residents using groundwater.
Lead levels were measured at 0.6 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 109 violations on record, including 1 health-based violation. 2 remain unresolved.
What to know about Mchenry's water
Mchenry ranks #10 out of 320 cities in Mississippi for water quality, placing it one of the best in the state.
Mchenry 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, Mchenry may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mchenry, MS water safe to drink?
Mchenry's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (90.8/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,653 residents using groundwater (wells).
Recent water quality updates for Mchenry
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mchenry's water quality assessment. Grade: A (90.8/100).
Contaminants: Chlorine.
Federal disaster declaration (FEMA DR-4626). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3569). Hurricane event — may have impacted local water infrastructure.
Contaminants: Radium-228, Radium-226.
Contaminants: Combined Uranium, Radium-226, Radium-228.
Key contaminant findings
Based on the most recent EPA sampling data for Mchenry's water supply.
Well within EPA limits.
Violation history
Mchenry's water system has 109 total violations on record, including 1 health-based violation. 2 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Stone County has experienced 10 federally declared disasters since 2012. 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 Biloxi River.
Where does Mchenry's water come from?
Mchenry's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,653 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Biloxi River (river).
What Mchenry 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.
Mchenry'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
Drought conditions
D2 — severe droughtStone 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
Stone County has experienced 10 federally declared disasters since 2012. 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. | 0.6 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mchenry compares by contaminant
Explore where Mchenry ranks among all Mississippi cities for specific contaminants.
Water source & infrastructure
Where Mchenry's water comes from
Mchenry'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 public/private ownership and serves approximately 1,653 people through 1 water system.
Water bodies near Mchenry
Mchenry is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mchenry
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MCHENRY UTILITY ASSN, INC | MS0660002 | 1,653 | GW |
How Mchenry compares
Full Mississippi rankings →Mchenry's score of 90.8/100 is above the average of 54/100 among major Mississippi cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Mississippi rankings →Learn more about your water
Guides and resources related to Mchenry's water quality findings.
Explore water quality across Stone
Frequently asked questions
Is Mchenry, MS tap water safe to drink?
Mchenry's water quality earned a grade of A (90.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #10 out of 320 cities tested in Mississippi.
What contaminants are in Mchenry's water?
Lead was measured at 0.6 ppb (90th percentile). 109 violations are on record.
How is Mchenry'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 Mchenry?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Mchenry's water come from?
Mchenry's water is sourced from Groundwater. The city has 1 water system serving approximately 1,653 residents.
What health violations has Mchenry's water system had?
Mchenry has 1 health-based violation on record. The most recent violation was recorded in April 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Mchenry's groundwater at risk of contamination?
Mchenry 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 109 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 Mchenry's water compare to other cities?
Mchenry ranks #10 out of 320 cities in Mississippi (better than 97% of state cities) and #2046 out of 15744 cities nationally (87th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mchenry's small water system affect quality?
Mchenry's system serves approximately 1,653 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 109 violations on record.