Is Filer, ID Tap Water Safe to Drink?
Graded B-, with 8 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
70.8/100
waterverge.com Filer, ID — Water Quality Report
Filer's drinking water received a grade of B- (70.8 out of 100), indicating fair water quality. The city's 1 water system serves approximately 2,858 residents using groundwater.
Lead levels were measured at 0.0 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 84 violations on record, including 34 health-based violations. 8 remain unresolved.
What to know about Filer's water
Filer ranks #72 out of 139 cities in Idaho for water quality, placing it below average in the state.
Filer 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, Filer may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 10 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Filer, ID water safe to drink?
Filer's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (70.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,858 residents using groundwater (wells).
Recent water quality updates for Filer
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Filer's water quality assessment. Grade: B- (70.8/100).
Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: Lead and Copper Rule.
Contaminants: E. COLI.
Federal disaster declaration (FEMA DR-4310). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3244). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Filer's water supply.
Well within EPA limits.
Violation history
Filer's water system has 84 total violations on record, including 34 health-based violations. 8 remain unresolved. 10 violations were issued in the last 5 years.
Flood & environmental risk
Twin Falls County has experienced 2 federally declared disasters 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 Snake River Nr Twin Falls, Rock Creek Ab Hwy 30/93 Xing, Snake River, Snake River Nr Buhl.
Where does Filer's water come from?
Filer's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,858 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Snake River Nr Twin Falls (river), Rock Creek Ab Hwy 30/93 Xing (river), Snake River (river), Snake River Nr Buhl (river).
What Filer residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Filer'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
Top industrial polluters within 10 miles of Filer
Industrial polluters nearby
Reported releases to surface water by facilities near Filer, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
LAMB WESTON INC TWIN FALLS, ID83301 | — | — | 6.4 mi |
AMALGAMATED SUGAR CO TWIN FALLS, ID83301 | — | — | 9.0 mi |
GLANBIA FOODS INC TWIN FALLS, ID83301 | — | — | 6.6 mi |
CHOBANI IDAHO TWIN FALLS, ID83301 | — | — | 8.8 mi |
LIPPERT COMPONENTS - TWIN FALLS #64 TWIN FALLS, ID83301 | — | — | 9.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D4 — exceptional droughtTwin Falls County is currently in D4 (exceptional drought) per the U.S. Drought Monitor (week of May 5, 2026). 26.4% of the county is in D4 (exceptional) drought. 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
Twin Falls County has experienced 2 federally declared disasters 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Filer compares by contaminant
Explore where Filer ranks among all Idaho cities for specific contaminants.
Water source & infrastructure
Where Filer's water comes from
Filer'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 2,858 people through 1 water system.
Water bodies near Filer
Filer is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Filer
| System Name | PWSID | Population | Source |
|---|---|---|---|
| FILER WATER WORKS | ID5420021 | 2,858 | GW |
How Filer compares
Full Idaho rankings →Filer's score of 70.8/100 is above the average of 43/100 among major Idaho cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Idaho rankings →About Filer, ID
Learn more about your water
Guides and resources related to Filer's water quality findings.
Explore water quality across Twin Falls
Frequently asked questions
Is Filer, ID tap water safe to drink?
Filer's water quality earned a grade of B- (70.8/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #72 out of 139 cities tested in Idaho.
What contaminants are in Filer's water?
Lead was measured at 0.0 ppb (90th percentile). 84 violations are on record.
How is Filer'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 Filer?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Filer's water come from?
Filer's water is sourced from Groundwater. The city has 1 water system serving approximately 2,858 residents.
What health violations has Filer's water system had?
Filer has 34 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
Is Filer's groundwater at risk of contamination?
Filer 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 84 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 Filer's water compare to other cities?
Filer ranks #72 out of 139 cities in Idaho (better than 48% of state cities) and #10675 out of 15744 cities nationally (32th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Filer's small water system affect quality?
Filer's system serves approximately 2,858 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 84 violations on record.