Is As Matuis, MP Tap Water Safe to Drink?
Graded C+ — but Lead was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
68.4/100
waterverge.com As Matuis, MP — Water Quality Report
As Matuis's drinking water received a grade of C+ (68.4 out of 100), indicating fair water quality. The city's 1 water system serves approximately 634 residents using groundwater.
Lead levels were measured at 19.0 ppb (90th percentile), which exceeds the EPA action level of 15 ppb. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 71 violations on record, including 0 health-based violations. 16 remain unresolved.
What to know about As Matuis's water
As Matuis ranks #3 out of 7 cities in Northern Mariana Islands for water quality, placing it mid-range in the state.
As Matuis 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.
Lead levels exceed the EPA action level of 15 ppb, which typically indicates aging lead service lines or lead solder in the distribution system. An NSF 53-certified filter is strongly recommended for drinking and cooking water.
As a small community water system, As Matuis may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is As Matuis, MP water safe to drink?
As Matuis's drinking water has significant quality concerns based on EPA testing data. With a grade of C+ (68.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 634 residents using groundwater (wells).
Recent water quality updates for As Matuis
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into As Matuis's water quality assessment. Grade: C+ (68.4/100).
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Key contaminant findings
Based on the most recent EPA sampling data for As Matuis's water supply.
Exceeds EPA action level. Lead service line replacement and point-of-use filtration recommended.
Violation history
As Matuis's water system has 71 total violations on record, including 0 health-based violations. 16 remain unresolved. 3 violations were issued in the last 5 years.
Where does As Matuis's water come from?
As Matuis's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 634 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What As Matuis residents can do
Recommended: NSF 53-certified pitcher or under-sink filter. This addresses the specific contaminants found in As Matuis'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Recommended water filters
Based on contaminants detected in As Matuis'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. | 19.0 | 15 | ppb | Inorganic | Over Limit |
Lead level trend (90th percentile)
See how As Matuis compares by contaminant
Explore where As Matuis ranks among all Northern Mariana Islands cities for specific contaminants.
Water source & infrastructure
Where As Matuis's water comes from
As Matuis'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 private ownership and serves approximately 634 people through 1 water system.
Water systems serving As Matuis
| System Name | PWSID | Population | Source |
|---|---|---|---|
| Kensington Hotel | MP0000071 | 634 | GW |
How As Matuis compares
Full Northern Mariana Islands rankings →As Matuis's score of 68.4/100 is above the average of 57/100 among major Northern Mariana Islands cities. It outscores 4 of 6 nearby cities.
Nearby cities
View Northern Mariana Islands rankings →Learn more about your water
Guides and resources related to As Matuis's water quality findings.
Frequently asked questions
Is As Matuis, MP tap water safe to drink?
As Matuis's water quality earned a grade of C+ (68.4/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #3 out of 7 cities tested in Northern Mariana Islands.
What contaminants are in As Matuis's water?
Lead was measured at 19.0 ppb (90th percentile). 71 violations are on record.
How is As Matuis'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 As Matuis?
Yes — lead levels exceed the EPA action level of 15 ppb. We recommend an NSF 53-certified filter or reverse osmosis system. Based on current data, basic filtration should suffice for additional peace of mind.
Where does As Matuis's water come from?
As Matuis's water is sourced from Groundwater. The city has 1 water system serving approximately 634 residents.
Is As Matuis's groundwater at risk of contamination?
As Matuis 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 71 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 As Matuis's water compare to other cities?
As Matuis ranks #3 out of 7 cities in Northern Mariana Islands (better than 57% of state cities) and #11083 out of 15744 cities nationally (30th percentile). The grade of C+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does As Matuis's small water system affect quality?
As Matuis's system serves approximately 634 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 71 violations on record.