Is Littlerock, WA Tap Water Safe to Drink?
Graded A, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
93.2/100
waterverge.com Littlerock, WA — Water Quality Report
Littlerock's drinking water received a grade of A (93.2 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 639 residents using groundwater.
Lead levels were measured at 3.0 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 19 violations on record, including 3 health-based violations. 1 remains unresolved.
What to know about Littlerock's water
Littlerock ranks #17 out of 294 cities in Washington for water quality, placing it one of the best in the state.
Littlerock 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, Littlerock may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Littlerock, WA water safe to drink?
Littlerock's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (93.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 639 residents using groundwater (wells).
Recent water quality updates for Littlerock
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Littlerock's water quality assessment. Grade: A (93.2/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Coliform (TCR).
Contaminants: Diquat.
Key contaminant findings
Based on the most recent EPA sampling data for Littlerock's water supply.
Well within EPA limits.
Violation history
Littlerock's water system has 19 total violations on record, including 3 health-based violations. 1 remain unresolved. 1 violation was issued in the last 5 years.
Where does Littlerock's water come from?
Littlerock's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 639 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Littlerock 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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
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. | 3.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Littlerock compares by contaminant
Explore where Littlerock ranks among all Washington cities for specific contaminants.
Water source & infrastructure
Where Littlerock's water comes from
Littlerock'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 state ownership and serves approximately 639 people through 1 water system.
Water systems serving Littlerock
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CEDAR CREEK CORRECTIONS CENTER | WA5311882 | 639 | GW |
How Littlerock compares
Full Washington rankings →Littlerock's score of 93.2/100 is above the average of 53/100 among major Washington cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Washington rankings →About Littlerock, WA
Wikipedia →Littlerock is an unincorporated community in Thurston County, Washington, United States. Littlerock is 11 miles (18 km) southwest of Olympia. The town is west of Interstate 5 and Maytown.
Learn more about your water
Guides and resources related to Littlerock's water quality findings.
Explore water quality across Thurston
Frequently asked questions
Is Littlerock, WA tap water safe to drink?
Littlerock's water quality earned a grade of A (93.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #17 out of 294 cities tested in Washington.
What contaminants are in Littlerock's water?
Lead was measured at 3.0 ppb (90th percentile). 19 violations are on record.
How is Littlerock'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 Littlerock?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Littlerock's water come from?
Littlerock's water is sourced from Groundwater. The city has 1 water system serving approximately 639 residents.
What health violations has Littlerock's water system had?
Littlerock has 3 health-based violations on record. The most recent violation was recorded in February 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Littlerock's groundwater at risk of contamination?
Littlerock 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 19 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 Littlerock's water compare to other cities?
Littlerock ranks #17 out of 294 cities in Washington (better than 94% of state cities) and #949 out of 15744 cities nationally (94th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Littlerock's small water system affect quality?
Littlerock's system serves approximately 639 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 19 violations on record.