Is Sheridan, MT Tap Water Safe to Drink?
Graded C-, with 10 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
58.6/100
waterverge.com Sheridan, MT — Water Quality Report
Sheridan's drinking water received a grade of C- (58.6 out of 100), indicating poor water quality. The city's 1 water system serves approximately 632 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 82 violations on record, including 0 health-based violations. 10 remain unresolved.
What to know about Sheridan's water
Sheridan ranks #67 out of 115 cities in Montana for water quality, placing it below average in the state.
Sheridan 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, Sheridan may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 47 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Sheridan, MT water safe to drink?
Sheridan's drinking water has significant quality concerns based on EPA testing data. With a grade of C- (58.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 632 residents using groundwater (wells).
Recent water quality updates for Sheridan
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Sheridan's water quality assessment. Grade: C- (58.6/100).
Contaminants: Nitrate-Nitrite.
Contaminants: Lead and Copper Rule.
Contaminants: Dinoseb, Hexachlorocyclopentadiene, Carbofuran.
Federal disaster declaration (FEMA DR-3253). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Sheridan's water supply.
Well within EPA limits.
Violation history
Sheridan's water system has 82 total violations on record, including 0 health-based violations. 10 remain unresolved. 47 violations were issued in the last 5 years.
Flood & environmental risk
Madison County has experienced 1 federally declared disaster since 2005. 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 Ruby River Near Twin Bridges, Beaverhead River At Twin Bridges.
Where does Sheridan's water come from?
Sheridan's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 632 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Ruby River Near Twin Bridges (river), Beaverhead River At Twin Bridges (river).
What Sheridan residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Sheridan'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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D3 — extreme droughtMadison 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
Madison County has experienced 1 federally declared disaster since 2005. 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 Sheridan compares by contaminant
Explore where Sheridan ranks among all Montana cities for specific contaminants.
Water source & infrastructure
Where Sheridan's water comes from
Sheridan'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 632 people through 1 water system.
Water bodies near Sheridan
Sheridan is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Sheridan
| System Name | PWSID | Population | Source |
|---|---|---|---|
| SHERIDAN TOWN OF | MT0000329 | 632 | GW |
How Sheridan compares
Full Montana rankings →Sheridan's score of 58.6/100 is above the average of 45/100 among major Montana cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Montana rankings →About Sheridan, MT
Learn more about your water
Guides and resources related to Sheridan's water quality findings.
Explore water quality across Madison
Frequently asked questions
Is Sheridan, MT tap water safe to drink?
Sheridan's water quality earned a grade of C- (58.6/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #67 out of 115 cities tested in Montana.
What contaminants are in Sheridan's water?
Lead was measured at 2.0 ppb (90th percentile). 82 violations are on record.
How is Sheridan'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 Sheridan?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Sheridan's water come from?
Sheridan's water is sourced from Groundwater. The city has 1 water system serving approximately 632 residents.
Is Sheridan's groundwater at risk of contamination?
Sheridan 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 82 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 Sheridan's water compare to other cities?
Sheridan ranks #67 out of 115 cities in Montana (better than 42% of state cities) and #12267 out of 15744 cities nationally (22th percentile). The grade of C- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Sheridan's small water system affect quality?
Sheridan's system serves approximately 632 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 82 violations on record.