Is Rock Springs, WY Tap Water Safe to Drink?
Graded C, with 29 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
64.8/100
waterverge.com Rock Springs, WY — Water Quality Report
Rock Springs's drinking water received a grade of C (64.8 out of 100), indicating fair water quality. The city's 12 water systems serve approximately 30,913 residents using purchased surface water.
Lead levels were measured at 1.0 ppb (90th percentile), well within EPA limits. UCMR 5 testing detected 1 PFAS compound in the water supply.
The system has 132 violations on record, including 5 health-based violations. 29 remain unresolved.
What to know about Rock Springs's water
Rock Springs ranks #41 out of 65 cities in Wyoming for water quality, placing it below average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
PFAS compounds were detected in testing, though levels remain within current EPA limits. Residents seeking extra precaution may consider an activated carbon or reverse osmosis filter.
Hexavalent chromium (chromium-6) was detected at 0.10 µg/L in UCMR 3 testing. While below California's 10 µg/L limit and with no federal MCL set, residents sensitive to this contaminant may consider reverse osmosis filtration.
The system has seen 11 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Rock Springs, WY water safe to drink?
Rock Springs's drinking water has significant quality concerns based on EPA testing data. With a grade of C (64.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 12 water systems serve approximately 30,913 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Rock Springs
A timeline of significant water quality events, violations, and data updates.
Detected at levels within current EPA limits. PFAS persist indefinitely in the environment.
Latest EPA compliance and testing data incorporated into Rock Springs's water quality assessment. Grade: C (64.8/100).
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
1 health-based. Contaminants: Long Term 2 Enhanced Surface Water Treatment Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Rock Springs's water supply.
Well within EPA limits.
Detected but within current EPA limits. PFAS do not break down in the environment and can accumulate in the body over time. An activated carbon filter can reduce exposure.
Violation history
Rock Springs's water system has 132 total violations on record, including 5 health-based violations. 29 remain unresolved. 11 violations were issued in the last 5 years.
Where does Rock Springs's water come from?
Rock Springs's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 12 water systems serving approximately 30,913 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Rock Springs residents can do
Recommended: Activated carbon or reverse osmosis filter. This addresses the specific contaminants found in Rock Springs'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 ↓Forever chemicals overview
National PFAS report →Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Rock Springs
Industrial polluters nearby
Reported releases to surface water by facilities near Rock Springs, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
SIMPLOT PHOSPHATES LLC ROCK SPRINGS, WY82901 | — | — | 0.8 mi |
P4 PRODUCTION LLC ROCK SPRINGS, WY82901 | — | — | 3.2 mi |
SUNROC CORP - LAGOON DRIVE READY MIX ROCK SPRINGS, WY82901 | — | — | 5.8 mi |
VERMILLION GAS PLANT ROCK SPRINGS, WY82901 | — | — | 0.8 mi |
PACIFICORP JIM BRIDGER PLANT & BRIDGER COAL CO POINT OF ROCKS, WY82942 | — | — | 2.1 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D4 — exceptional droughtSweetwater County is currently in D4 (exceptional drought) per the U.S. Drought Monitor (week of May 5, 2026). 0.2% 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.
Recommended water filters
Based on contaminants detected in Rock Springs's water supply, we recommend the following filter types.
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 |
| 11Cl-PF3OUdS | ND | HI | µg/L | PFAS | Not Detected |
| 4:2 FTS | ND | HI | µg/L | PFAS | Not Detected |
| 6:2 FTS 6:2 FTSPFAS A fluorotelomer sulfonate commonly found at sites contaminated with aqueous film-forming foam (AFFF) used in firefighting. Health EffectsPotential liver toxicity and endocrine disruption. Less studied but identified as a contaminant of concern. EPA LimitNo individual MCL (not yet regulated) Common SourcesFirefighting foam (AFFF), airports, military bases, and industrial facilities. | ND | HI | µg/L | PFAS | Not Detected |
| 8:2 FTS | ND | HI | µg/L | PFAS | Not Detected |
| 9Cl-PF3ONS | ND | HI | µg/L | PFAS | Not Detected |
| ADONA | ND | HI | µg/L | PFAS | Not Detected |
| HFPO-DA HFPO-DA (GenX)PFAS A replacement for PFOA in manufacturing, marketed as safer but still a persistent "forever chemical." Also known as GenX. Health EffectsLiver and kidney effects, reproductive toxicity, immune system effects, and potential cancer risk. EPA Limit10 ppt MCL Common SourcesFluoropolymer manufacturing (used as PFOA replacement), industrial wastewater discharge. | ND | 0.01 | µg/L | PFAS | Not Detected |
| lithium LithiumInorganic A naturally occurring alkali metal found in groundwater. Monitored under UCMR 5 to assess occurrence in drinking water. Health EffectsKidney effects at high doses. Low-level exposure effects under study; some research suggests neurological effects. EPA LimitNo MCL (monitoring only under UCMR 5) Common SourcesNatural mineral deposits, geothermal water, and industrial discharge. | 16.000 | HI | µg/L | PFAS | Detected |
| NEtFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| NFDHA | ND | HI | µg/L | PFAS | Not Detected |
| NMeFOSAA | ND | HI | µg/L | PFAS | Not Detected |
| PFBA PFBAPFAS One of the shortest-chain PFAS compounds. Very mobile in water and difficult to remove with standard filtration. Health EffectsThyroid effects, potential developmental toxicity. Shorter half-life in body than long-chain PFAS. EPA LimitNo individual MCL (not yet regulated) Common SourcesDegradation of longer-chain PFAS, industrial discharge, and firefighting foam. | ND | HI | µg/L | PFAS | Not Detected |
| PFBS PFBSPFAS A short-chain PFAS used as a replacement for PFOS. While it clears the body faster than long-chain PFAS, it still persists in the environment. Health EffectsThyroid effects, reproductive and developmental toxicity, kidney effects. EPA LimitPart of Hazard Index (1.0) Common SourcesIndustrial discharge, firefighting foam, and as a replacement chemical in manufacturing. | ND | HI | µg/L | PFAS | Not Detected |
| PFDA | ND | HI | µg/L | PFAS | Not Detected |
| PFDoA | ND | HI | µg/L | PFAS | Not Detected |
| PFEESA | ND | HI | µg/L | PFAS | Not Detected |
| PFHpA PFHpAPFAS A medium-chain PFAS compound found in various environmental samples. Less studied than PFOA/PFOS but still considered a contaminant of concern. Health EffectsLiver effects, potential developmental toxicity, and endocrine disruption. EPA LimitPart of Hazard Index (1.0) Common SourcesDegradation of longer-chain PFAS, industrial discharge, and contaminated water sources. | ND | HI | µg/L | PFAS | Not Detected |
| PFHpS | ND | HI | µg/L | PFAS | Not Detected |
| PFHxA PFHxAPFAS A short-chain PFAS replacement chemical widely used after manufacturers phased out longer-chain PFAS. Very commonly detected in water. Health EffectsLiver and kidney effects, potential thyroid disruption. Considered less toxic than long-chain PFAS but still persistent. EPA LimitNo individual MCL (not yet regulated) Common SourcesIndustrial processes, firefighting foam (AFFF), food packaging, and textile treatment. | ND | HI | µg/L | PFAS | Not Detected |
| PFHxS PFHxSPFAS A medium-chain PFAS found in firefighting foam and consumer products. It has a long half-life in the human body, similar to long-chain PFAS. Health EffectsImmune system effects, thyroid disruption, and potential reproductive and developmental harm. EPA LimitPart of Hazard Index (1.0) Common SourcesFirefighting foam (AFFF), waterproof textiles, food packaging, and industrial discharge. | ND | HI | µg/L | PFAS | Not Detected |
| PFMBA | ND | HI | µg/L | PFAS | Not Detected |
| PFMPA | ND | HI | µg/L | PFAS | Not Detected |
| PFNA PFNAPFAS A long-chain PFAS compound used in manufacturing fluoropolymers. It bioaccumulates in the body and is very persistent in the environment. Health EffectsDevelopmental effects, liver toxicity, immune suppression, and potential cancer risk. EPA LimitPart of Hazard Index (1.0) Common SourcesFluoropolymer manufacturing, industrial emissions, and contaminated water sources. | ND | HI | µg/L | PFAS | Not Detected |
| PFOA PFOAPFAS A long-chain PFAS ("forever chemical") once widely used in nonstick coatings and firefighting foam. It persists in the body and environment for years. Health EffectsLinked to kidney and testicular cancer, thyroid disease, elevated cholesterol, and reproductive issues. EPA Limit4.0 ppt MCL Common SourcesIndustrial discharge, firefighting foam (AFFF), nonstick cookware manufacturing, and contaminated groundwater. | ND | 0.004 | µg/L | PFAS | Not Detected |
| PFOS PFOSPFAS A long-chain PFAS compound historically used in stain-resistant coatings and firefighting foam. One of the most studied and persistent PFAS chemicals. Health EffectsLiver damage, immune system suppression, thyroid disruption, increased cholesterol, and potential cancer risk. EPA Limit4.0 ppt MCL Common SourcesFirefighting foam (AFFF), industrial sites, stain-resistant fabric treatments, and contaminated groundwater. | ND | 0.004 | µg/L | PFAS | Not Detected |
| PFPeA PFPeAPFAS A short-chain PFAS compound commonly detected in drinking water. One of the most frequently found PFAS in UCMR 5 monitoring. Health EffectsLess studied than PFOA/PFOS. Potential liver and thyroid effects. Research is ongoing. EPA LimitNo individual MCL (not yet regulated) Common SourcesIndustrial discharge, firefighting foam degradation, and consumer products. | ND | HI | µg/L | PFAS | Not Detected |
| PFPeS | ND | HI | µg/L | PFAS | Not Detected |
| PFTA | ND | HI | µg/L | PFAS | Not Detected |
| PFTrDA | ND | HI | µg/L | PFAS | Not Detected |
| PFUnA | ND | HI | µg/L | PFAS | Not Detected |
Lead level trend (90th percentile)
See how Rock Springs compares by contaminant
Explore where Rock Springs ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Rock Springs's water comes from
Rock Springs's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 30,913 people through 12 water systems.
Water systems serving Rock Springs
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ROCK SPRINGS, CITY OF | WY5601182 | 24,000 | SWP |
| WHITE MOUNTAIN W&S DISTRICT | WY5601391 | 3,000 | SWP |
| CLEARVIEW I&S DISTRICT | WY5600091 | 930 | SWP |
| SKYLINE VILLAGE MOBILE HOME PK | WY5601176 | 700 | SWP |
| WESTERN HILLS MHP | WY5601085 | 450 | SWP |
| LEWIS MOBILE HOME PARK | WY5601175 | 370 | SWP |
| HORIZON MHP | WY5600088 | 330 | SWP |
| TEN MILE WATER AND SEWER DISTRICT | WY5601369 | 305 | SWP |
| MOBILE CORRALS/STALLS COURT | WY5601203 | 300 | SWP |
| WHITE MOUNTAIN MOBILE HOME PARK | WY5601206 | 270 | SWP |
| GARCIA MOBILE HOME PARK | WY5601746 | 148 | SWP |
| W BAR K MOBILE HOME PARK | WY5601607 | 110 | SWP |
How Rock Springs compares
Full Wyoming rankings →Rock Springs's score of 64.8/100 is above the average of 53/100 among major Wyoming cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Wyoming rankings →Learn more about your water
Guides and resources related to Rock Springs's water quality findings.
Explore water quality across Sweetwater
Frequently asked questions
Is Rock Springs, WY tap water safe to drink?
Rock Springs's water quality earned a grade of C (64.8/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #41 out of 65 cities tested in Wyoming.
What contaminants are in Rock Springs's water?
Lead was measured at 1.0 ppb (90th percentile). 1 PFAS compound was detected. 132 violations are on record.
How is Rock Springs'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 Rock Springs?
PFAS compounds have been detected. A filter with activated carbon can help reduce exposure.
Where does Rock Springs's water come from?
Rock Springs's water is sourced from Purchased surface water. The city has 12 water systems serving approximately 30,913 residents.
What health violations has Rock Springs's water system had?
Rock Springs has 5 health-based violations on record. The most recent violation was recorded in December 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 29 violations remain unresolved.
How does Rock Springs's water compare to other cities?
Rock Springs ranks #41 out of 65 cities in Wyoming (better than 37% of state cities) and #11611 out of 15744 cities nationally (26th percentile). The grade of C reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.